Malicious PDF — malware analysis report

Static analysis result for SHA-256 370044ce352b7c69…

MALICIOUS

PDF

48.5 KB Created: 2020-08-04 15:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddb2790ffb48315b531fc2238e8ada4e SHA-1: 6d941984deb13b5b34102f944b0f8a0926003972 SHA-256: 370044ce352b7c6945d80170ff945c364335244133e20dc948c03530cf99f59f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which are part of a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at ttraff.com. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'uniform circular motion worksheet answer key' which appears to be a lure to disguise the malicious link farm.

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/wb?keyword=uniform%20circular%20motion%20worksheet%20answer%20key
    • http://files.seanjmnewman.com/uploads/1/3/0/9/130969312/dimuzamupu.pdf
    • http://files.chinadynastybeamsville.com/uploads/1/3/1/0/131070846/sipigiro_xesejeso_nuvadopatuwazo_kolag.pdf
    • http://files.effortlesssocial.com/uploads/1/3/1/4/131455247/sonono.pdf
    • http://kugodev.greatautismresources.com/uploads/1/3/0/8/130873995/5508124.pdf
    • http://files.mohpg.org/uploads/1/3/1/4/131406086/21fdd7ae70b7f3.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/75938916840.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58829080427.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/13379197187.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3752/files/anthony_brown_worth_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/nimojugarufaloxuvotabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1796/9570/files/gowibirulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/59729756417.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/9233310495.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5376/files/69102430017.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/16916920528.pdf
    • https://cdn.shopify.com/s/files/1/0440/6371/9574/files/punta_rassa_tides.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/31265175503.pdf
    • https://cdn.shopify.com/s/files/1/0432/4219/3058/files/42800253840.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/neraforotegababepugili.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/savupuxog.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/1/042

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000793b.bin
86dfcc660f79c4afd195cd9c200fd6d79bb597f626d2b42537c46f2a06aa7e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793B 5368 bytes
font_01_sfnt_off00008b6f.bin
e417d0ccc1304d96210ff6ee8c6ad1d1babe6f8d79d030004a492cac15bf8449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 13000 bytes

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