MALICIOUS
234
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 PowerShell
The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=acm+icpc+2020+problems+pdf'. This URL is presented within the document body, disguised as a link to 'acm icpc 2020 problems pdf'. The file also contains a large number of external PDF links, many hosted on shopify.com, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, and the document body is heavily obfuscated, but the primary intent appears to be redirecting the user to malicious infrastructure.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 6
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PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINKPDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARMSmall PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINKPDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINKPDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL https://ttraff.com/pify?keyword=acm+icpc+2020+problems+pdf In PDF document text
- http://files.saintpaulcatholicchurchpocahontas.com/uploads/1/3/2/7/132740865/9848483.pdfIn PDF document text
- http://parexa.diypaintguy.com/uploads/1/3/0/7/130775734/kirajimivo_dasotefez_firulomiwuv_pinudulebuz.pdfIn PDF document text
- http://files.3haivhmoob.com/uploads/1/3/1/8/131856435/sopavodor_xebok_meputesomiko.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/2050/9596/files/54171384769.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/4923/8178/files/xeduvaliletebidimufewa.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0441/1555/8552/files/cantaloupe_island_piano_sheet_music.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/3117/4039/files/kesonuwetaxaloruk.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/5893/8531/files/taralobadetatadedetipil.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/5530/0249/files/60280075500.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/7755/8681/files/weveroxejurufa.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0430/0200/3615/files/xifewitewuzij.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0436/4884/3929/files/20719708884.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/3091/2934/files/96262992924.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/1141/5959/files/nobamip.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off0000602b.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x602B | 5492 bytes |
SHA-256: 0127fe0a1ee965903b8bd320674fff06ae428ec91e9fdb658563bde7072866f4 |
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font_01_sfnt_off000072c4.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x72C4 | 10572 bytes |
SHA-256: 9be8b9543b7e9df5959be40405ec326644521642ea851088a09db3c404b55756 |
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