MALICIOUS
234
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 PowerShell
The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a document about 'microbiology culture techniques pdf'. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive document, leading to a malicious redirector.
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.ru/pify?keyword=microbiology+culture+techniques+pdf In PDF document text
- http://files.stalwartarms.com/uploads/1/3/1/6/131607163/pepiroxolorobe.pdfIn PDF document text
- http://files.moldandwaterdamagespecialistinc.com/uploads/1/3/1/4/131408170/4551431.pdfIn PDF document text
- http://files.melissacoaching.com/uploads/1/3/0/7/130775537/mimoge-ruwupedipiviv.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/1/0434/1461/8277/files/63863572654.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/8312/8214/files/womixaxesixa.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/0686/0187/files/tifemubolomajabewowese.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/1311/9905/files/kiwomozokiguk.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/1117/7626/files/7848263877.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/0831/9907/files/nekejefiwumizena.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0438/0724/4450/files/pomomuzisi.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0436/0696/6429/files/33788988451.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/9775/9643/files/32679941112.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/8424/2337/files/lugudulud.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/2177/0656/files/3971710713.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/2100/1119/files/41252414583.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_off00007cd7.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x7CD7 | 5580 bytes |
SHA-256: 0229a42acc647d1b5c4960f565f6953808c5a1b36598c92f6b36968a207b373c |
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font_01_sfnt_off00008fcf.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x8FCF | 10032 bytes |
SHA-256: 4a13b67765611182892818bd62cf491c93ac82b15c65c3d44adcbf4330daf9cb |
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