Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf732592fb5d216…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 01:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f3cc879b36c0ce5dde077eb6bc479ec SHA-1: 7601b1189312c4c4761ef08a8d692cf723a1b7e2 SHA-256: 6bf732592fb5d216b1fa2b5f3ebbd83b68dd1d8a6ed52be827645aa6ff840e28
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a video download, and the presence of embedded URLs suggests an attempt to redirect the user to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=gattu+battu+mp4+video
    • http://jaketafa.hairymosquito.com/uploads/1/3/0/9/130969690/bofoz.pdf
    • http://jijotuli.jackleesworld.com/uploads/1/3/0/7/130775735/nafegiwelapagi-delujuduj-rilozuzokaluku.pdf
    • http://mopesu.omnisens.com/uploads/1/3/0/8/130874359/29db52625.pdf
    • http://files.getfitwithida.com/uploads/1/3/0/7/130738871/779580.pdf
    • http://latoti.americanfamilyfeed.com/uploads/1/3/2/7/132712324/fasigej_fugawaneb_towake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/624351082.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/la_hija_del_vampiro_triunfo_arciniegas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/tupac_albums_download_zip.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/90331297137.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/lojezirepusenunafimojibo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/asia_map_with_country_names_and_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0434/7314/1912/files/33323256109.pdf
    • https://cdn.shopify.com/s/files/1/0449/5484/5352/files/raspberry_pi_cmdline._txt.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/vamamuvev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/katalog_cat_besi_avian.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/16467766865.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/tovebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/30333143739.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/
    • https://cdn.shopify.com/s/files/1/0434/4751
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ce.bin
792dd2d0489b5366e81e5894b870a596423612cc41169ae7647aa62985bacee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CE 4892 bytes
font_01_sfnt_off00006788.bin
9fd97e06faf99c613916c89984413919f412bcb03b9274e840a4ce6219c40515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 10132 bytes
font_02_sfnt_off000089bb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BB 4324 bytes

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