Malicious PDF — malware analysis report

Static analysis result for SHA-256 970c7f159f4f1df3…

MALICIOUS

PDF

53.7 KB Created: 2020-08-05 10:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8da4d2ff6e6c82ab6da93938f5907be SHA-1: edea978dce8dd329daeda9bc0df39428f7176213 SHA-256: 970c7f159f4f1df3725233b2069f58b175ffbf1a4dd93e4e84a232d76172e077
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and references a PDF about equations, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=einfache+gleichungen+mit+l%25C3%25B6sungen+pdf
    • http://files.fcdetail.com/uploads/1/3/1/3/131381067/27f7879d166.pdf
    • http://files.heartofachildministries.org/uploads/1/3/2/7/132712447/e7a59137c8ce5a.pdf
    • http://files.billinghurstorchestras.org/uploads/1/3/1/4/131407357/03772a75e78b.pdf
    • http://files.reentrylegalclinic.org/uploads/1/3/1/0/131071019/mukoratadojox_zavurado_peges_kakadujotulud.pdf
    • http://files.entotofoundation.org/uploads/1/3/2/6/132680796/a0efe9b.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/44578511866.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/nidamuwujogow.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/14778043478.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/suviwas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/10928331437.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/85435629373.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/ssa-_3441-_bk.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/puzokowuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/judepe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/tipos_de_actuadores_automotrices.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/bsc_2nd_year_inorganic_chemistry_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/manevoresorakevigerokiwes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/vanaspati_vigyan_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/gejinimenitolosuvugule.pdf
    • https://cdn.shopify.com/s/files/1/0436/5893/6473/files/what_is_the_max_width_for_mobile.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000759a.bin
2cd46fab7b0a3fe2153080b73e8904c2967ef9b1389c540368f0345c6676d741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759A 5568 bytes
font_01_sfnt_off0000882e.bin
8f368d2fc7d5d66af1ea51c9c921017b3c330b50cc7fc985e270b40dab2b93a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882E 12960 bytes
font_02_sfnt_off0000b284.bin
eccb4a4e23ec17ef3ae34a7e59b2b3ca0bade477786653c37f50dbc176102729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16060 bytes

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