Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcf6a9dd752f4f9…

MALICIOUS

PDF

47.6 KB Created: 2020-08-24 01:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178152903fe9fce7abc9d5d0054d5a00 SHA-1: 57f8ad3c4c89b980a451b210e9b1e18a2d222dfd SHA-256: 1dcf6a9dd752f4f95430f3537e42917caef14c8bf87e94b5927ca097b7924f55
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). The document body, though heavily obfuscated, contains text related to 'math calculator apk' and the malicious URL, suggesting a lure for users to download a malicious application. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The 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.
  • Embedded URL info EMBEDDED_URL
    One 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=math+calculator+apk
    • http://files.labexplosion.com/uploads/1/3/2/7/132710661/kolenufexoxob-zebivexezemisax.pdf
    • http://fijiser.matrixbathfittings.com/uploads/1/3/2/6/132682883/1a1eb6f.pdf
    • http://files.caldwellgill.com/uploads/1/3/0/7/130738482/62a50ed1c54.pdf
    • http://files.adamhuckebymusic.com/uploads/1/3/0/9/130969385/290be76b07690d4.pdf
    • https://cdn.shopify.com/s/files/1/0433/5081/8969/files/40688122748.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/psicologia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/gaxugedidopizetezosivonol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/list_of_rhyming_words_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/1277/6351/files/pesewoditafapexerake.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/ab_inbev_2016_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/bootstrap_boilerplate_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/0074/1531/files/42980908467.pdf
    • https://cdn.shopify.com/s/files/1/0435/6446/6335/files/dermatophytes_traitement_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/kategetonewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3149/3784/files/kagunefafegekes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/noseboka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000576a.bin
ff49440287dafc3bcf5ae4c26dfb19d23ace224daabbf0d420839b03466734a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576A 4912 bytes
font_01_sfnt_off00006814.bin
588833e1b7e4608ab21f6c7bfacc3871965467a58f084fbc6fe9d122f9ad106d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6814 4364 bytes
font_02_sfnt_off00007931.bin
d1f274af6e772098de9f05c66b3fb52c7bcfd3c70aa931b31aa58f7ddf7678a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 9856 bytes
font_03_sfnt_off00009b2b.bin
b17d8966426d1f4bce5a669f881c6cd0c2fbbdcc40b65066d9d0bf4b9a37b8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2B 16360 bytes

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