Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f58051e522217f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9473067547f0cd6221493b64e80f8319 SHA-1: e5572faac1e9491116e5aca98f11db540c2b5d41 SHA-256: f6f58051e522217f287b70c394ad07bf4199d2717b98aca1b40089e1cdcc8c9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector. The document body text and embedded links suggest a lure related to educational materials to encourage clicks.

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=4th+grade+math+multiplication+pdf In PDF document text
    • http://junizoma.repetto5.com/uploads/1/3/1/3/131383483/muwozijimewejasoledi.pdfIn PDF document text
    • http://files.pipereeds.com/uploads/1/3/0/8/130874610/wolugelozodujepi.pdfIn PDF document text
    • http://files.petstylz.com/uploads/1/3/0/9/130969728/nedotutiwazu_tibobobuten.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/1/0438/1127/4914/files/wezomavubulekegiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/lebunepipolowizarufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/27077894061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/70228798374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/nazafabovadudojikar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/kituvemifisatakogix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/raketalizopubevasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/serenade_schubert_liszt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/83474147297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/jotekotafepadukin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/5e_character_sheet_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/4103/4135/files/annual_report_apple.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.

FilenameKindSourceSize
font_00_sfnt_off00006321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6321 5384 bytes
SHA-256: 9aa2a74fc7dff37f8a34a7821f1eb8b394f4087f53d5b665f740e2d60b9bedb3
font_01_sfnt_off0000754e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x754E 9896 bytes
SHA-256: 71beaca9fab29fec56951d3c49c8c543251899208d0b171402d73ffd17d6b65a

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