Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f471e3ec13a8a83…

MALICIOUS

PDF

63.0 KB Created: 2020-08-05 09:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2193ffa02d47c1049d3c2afde6341739 SHA-1: 244a231de71b2d39f3c4c85068a3cd2b9cd3c69f SHA-256: 5f471e3ec13a8a830b905dbff8e1714b8f2932fd20e87f4dc8841f6a112f0a61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. No scripts were extracted, but the structure and embedded links are highly suspicious.

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=poemas+fernando+pessoa+pdf
    • http://files.reachoutlakota.org/uploads/1/3/0/8/130873838/ruvigukut_nexez_mopomunudi_xipukuxof.pdf
    • http://files.sweetpapercreations.com/uploads/1/3/2/6/132696274/surenu_fonoboweja_lotomarifukup_sugiki.pdf
    • http://pimurig.chhsseniors.com/uploads/1/3/1/6/131636612/c9b5523906.pdf
    • http://vubiviris.naturaltreatmentarthritis.com/uploads/1/3/1/6/131636719/gezedawosizuw.pdf
    • http://files.alzheimersocclub.com/uploads/1/3/1/3/131379037/babiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/nufosaruwiredu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/newise.pdf
    • https://cdn.shopify.com/s/files/1/0429/6369/7817/files/refomutonuganab.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/lolelunude.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/mubuzibofuzagakazufok.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/25489165940.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/horse_sex_gif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/list_of_ios_devices.pdf
    • https://cdn.shopify.com/s/files/1/0435/4283/9455/files/sozuridiladejuvile.pdf
    • https://cdn.shopify.com/s/files/1/0429/9223/8745/files/read_new_moon_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/8056/3350/files/51417896071.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/permission_denied_publickey_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/35293282768.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/luxisavus.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/mujubaguzine.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009437.bin
30b53ad241a725f8f20f3ab2df13cf33ed3bfce93f4a41e53870484d3326b92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9437 4816 bytes
font_01_sfnt_off0000a45a.bin
e0a3da0d9df8afafb6ebc106925084363a3fd21b39cc179777dd18f138c7ab6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA45A 2032 bytes
font_02_sfnt_off0000adde.bin
011713cacd0ecb06be5314d2c13c1b11ce23f0118a75ff142c0c64f4e179f4eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADDE 17380 bytes
font_03_sfnt_off0000deb8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 4324 bytes

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