Malicious PDF — malware analysis report

Static analysis result for SHA-256 341ca3c867c9eb15…

MALICIOUS

PDF

35.5 KB Created: 2020-08-17 03:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a22cbc026785ee2c6c80f7c5f2b06754 SHA-1: e2ac16b3eb503bd38bfeb98d4dee2d3890e8d651 SHA-256: 341ca3c867c9eb15f5fb9ebb5cfa3972b96730de72fe6ad259f6e434bbf37bbb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector at `https://ttraff.cc/pify?keyword=dilutions+worksheet+m1v1%253D+m2v2`. The document body, though partially obfuscated, also contains this URL and other links to external PDFs, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF 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.
  • 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.cc/pify?keyword=dilutions+worksheet+m1v1%253D+m2v2
    • http://gafaluv.petalsfromabelovedbridesbouquet.com/uploads/1/3/1/4/131437987/mokurijude-manajefalarof-malikurupofoki.pdf
    • http://files.muskegonapostolic.net/uploads/1/3/0/7/130739419/lewugefisokefuz.pdf
    • http://sumuwona.jtspowerwashingpros.com/uploads/1/3/1/1/131163599/wipisibikogavunope.pdf
    • http://files.kenglishllc.com/uploads/1/3/2/6/132695397/dabadixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/questes_de_concurso_atos_administrativos.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/zupuwadasulakem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/nivaxizasemoferebilerukaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/kuxetonapezat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/finance_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/53641883895.pdf
    • https://cdn.shopify.com/s/files/1/0450/3427/4966/files/puxamuvodofuxobevojiro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9414/6200/files/7637781608.pdf
    • https://cdn.shopify.com/s/files/1/0437/2152/3349/files/today_malayalam_manorama_news_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/budaya_patriarki_adalah.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d09.bin
b748debc291c6a940b479cfda70448857fd33fe06c426815fb43f9e413030394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D09 5160 bytes
font_01_sfnt_off00005e89.bin
a7f4191aa655cff72f23e5711604c035bd33dedbc3b149676dd8a07201095fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 10172 bytes

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