Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29f1801ab0fda14…

MALICIOUS

PDF

53.6 KB Created: 2020-10-07 01:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2de62924a1fe51cfbf65122ede7be2bb SHA-1: d2e35dc89f2906b7c079a08d13aaf78cc22b9a0f SHA-256: b29f1801ab0fda1403c219e1afe39a5681caf3dd0eb732f6a809adb753a63390
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external PDF links, including one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL associated with the malicious redirector, suggesting an attempt to direct users to harmful content.

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://gettraff.ru/pify?keyword=www+e+reading+club In PDF document text
    • http://nufoxewav.empoweraction.net/uploads/1/3/0/8/130874666/sumis.pdfIn PDF document text
    • http://files.mphsteam.org/uploads/1/3/1/3/131398457/vovopuzasowazevufovo.pdfIn PDF document text
    • http://files.sandytoessociety.org/uploads/1/3/0/9/130969206/5284079.pdfIn PDF document text
    • http://files.cattailacres.com/uploads/1/3/2/6/132681824/4391707.pdfIn PDF document text
    • http://nadoxobun.gonglumvrice.com/uploads/1/3/1/4/131437462/43962.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/1/0483/8352/5013/files/67904365484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/1967/4271/files/watership_down_characters_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3937/2965/files/jikodotedaxuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3495/1071/files/adobe_acrobat_pro_xi_serial_number_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8848/1955/files/94533125882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9284ad69-156f-4e88-bb3d-5fb06955b1d9/12125127648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f2d4ca-e491-420f-b660-fa6ddcf73555/20832746282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1911b4d5-3550-409b-8b4f-5e5cfd37e026/jabolerikumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2143/7608/files/vevokuwojetifuretodatov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/18503590373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/creating_magic_lee_cockerell.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_off0000923a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x923A 5176 bytes
SHA-256: 21e4e166d29743ac9b4fb75438e334335d2892405042fbe21fb687888c1e4125
font_01_sfnt_off0000a3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FF 11416 bytes
SHA-256: c5fba61bc0fae76c512690cddd8124fcbcce3f8a7f09a10036c6175a00aed6e1

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