Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c2b2997150ef37…

MALICIOUS

PDF

38.6 KB Created: 2020-08-13 22:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb89750badad2ffa10a9a1b65c212a52 SHA-1: fad305f357dc0c9eef7708869683b893a71bf3e3 SHA-256: 55c2b2997150ef37e2d0a485a87d437a32b97c1ccc38d43b314ee0ccd9b4ad2b
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which are part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains text related to an album and metadata indicating it was generated by wkhtmltopdf, suggesting a potential SEO manipulation or redirection scheme rather than a typical user-facing lure.

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=a+twist+in+my+story+album
    • http://files.aprilgentry-sutterfield.com/uploads/1/3/0/9/130969714/1201640.pdf
    • http://files.floristrycentral.com/uploads/1/3/1/3/131381352/kuporutek_wogad_remow_baxini.pdf
    • http://files.listerrentsequipment.com/uploads/1/3/1/4/131438418/ed7df869b91.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/jilejexobesaselesotel.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9288/files/39040536724.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/79397349444.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/jijukefokenipejikosix.pdf
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/lirikolopowevipujoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/77841973135.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/74752761052.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/levemilo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/zopibaguzabesikeg.pdf
    • https://cdn.shopify.com/s/files/1/0441/2473/3592/files/rikazutemeta.pdf
    • https://cdn.shopify.com/s/files/1/0430/6957/1233/files/zifopugere.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005965.bin
0818497eed591c5d99eb314dc196335cb72ad985eba71efa5b04d403fedd3003
pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 5156 bytes
font_01_sfnt_off00006adb.bin
da2ec83056c8e60922c6618198b1ed68f1f49347597d420447ed247a200b4aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADB 10248 bytes