Malicious PDF — malware analysis report

Static analysis result for SHA-256 b743bdd4d5c2f377…

MALICIOUS

PDF

45.1 KB Created: 2020-08-26 07:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f12d3d8dbb0e9b025ad0bedceaf9a61 SHA-1: 46edffa8b4cf1dc6e89aa94974de53e939b9ebf6 SHA-256: b743bdd4d5c2f377bf7e58efb1e1608d2dfcdaba185363ab0fb08f941eae2954
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=the+way+the+world+works', which is flagged as a malicious redirector. This suggests the primary purpose is to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=the+way+the+world+works
    • http://baduvov.jacquelinecutler.com/uploads/1/3/0/8/130814229/76e426f43da.pdf
    • http://files.livingwatersmin.net/uploads/1/3/1/3/131384635/c852a048aea383b.pdf
    • http://files.locomotiveespresso.com/uploads/1/3/0/9/130969681/sedovelorejedonulaj.pdf
    • http://files.basicsoflearning.com/uploads/1/3/2/8/132815123/buvagedo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/viwis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/43883625656.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/75448881689.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/gojiwugagowazokirenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0091/3310/files/sopumusugewopagojolaze.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/62150447785.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3798/files/uttarakhand_home_guard_bharti_2019_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/gokevepubazetogijomazad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/minecraft_village_house_transformation.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/24333693557.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/35310499508.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_off000073fa.bin
baf391bdd930cf100e39de77f0c73a6b91f71b8b958a5ec92c9fd78224c4e047
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 5120 bytes
font_01_sfnt_off00008571.bin
1ca2447b2bbc380bee2dc58deca822819c61c7140fc46e4be1374692a05fb0ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8571 10024 bytes