Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c138b9faedf5e1…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 19:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ab1961b7f760d90af6354b9801769c3 SHA-1: 390b725fc68cf81e8dff0c98fc33aa77d97ceab0 SHA-256: e2c138b9faedf5e1957df5ce7828aaf98c6db362c1af75e2d42f940a1d97a858
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=keto+diet+plan+pdf+free'. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify URLs, suggesting a link farm for SEO poisoning or traffic redirection. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern is a lure to a malicious redirector disguised as a free keto diet plan.

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.ru/pify?keyword=keto+diet+plan+pdf+free
    • http://zukuzav.mdyc.com/uploads/1/3/1/4/131452883/davebete_sabul_japitolok.pdf
    • http://vebokag.alishahmalik.com/uploads/1/3/0/8/130814328/ledaxoligofomevigido.pdf
    • http://pewego.greenwaynurseryandrainbowclub.com/uploads/1/3/1/1/131163635/2191879.pdf
    • http://files.apco-florida.org/uploads/1/3/1/4/131437276/danetidajupizi.pdf
    • http://gulepiw.monavalehospitalauxiliary.org/uploads/1/3/1/4/131407005/fuwonefaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/mutumegiduvusaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/1374533860.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/66114701446.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/10913101784.pdf
    • https://cdn.shopify.com/s/files/1/0435/7704/9247/files/5738413072.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/bawujibojajeso.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/ditugalowefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/life_code_dr_phil.pdf
    • https://cdn.shopify.com/s/files/1/0429/9446/6969/files/camus_the_stranger_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/88912819356.pdf
    • https://cdn.shopify.com/s/files/1/0435/5630/7107/files/9136437648.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce6.bin
4503a7a606abf9b76eb26d211d5005089bc7b126f07e5983496358f37469499c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE6 4616 bytes
font_01_sfnt_off00007c9b.bin
fde8b854dff0f6c3c7b562f91412d44e7746bd0bc1b398cc895393ed1d5bb01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9B 9968 bytes
font_02_sfnt_off00009ea8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA8 4324 bytes

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