Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb8cfc71a9d6416…

MALICIOUS

PDF

45.4 KB Created: 2020-08-14 22:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e593ead513d8804c9b1561849a3b15a1 SHA-1: 4670e8bced719ded103589877774a26037e4970b SHA-256: 2cb8cfc71a9d64165a836dbef3c611dff503af2d085a9bb6a8a5ca6e4c871599
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though partially corrupted, includes the same URL and topic, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the primary malicious activity appears to be redirecting 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://ttraff.com/pify?keyword=les+accents+en+francais+grammaire+pdf
    • http://jekaji.grinerdrillingservice.com/uploads/1/3/1/6/131606365/e5681334a4d118.pdf
    • http://files.fcpsartsacademy.org/uploads/1/3/0/8/130815009/6fbecafced9477.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2967/files/fasibigatewopedokawob.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/2436872507.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6440/files/cause_and_effect_paragraph_sample.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/rig_veda_sanskrit_slokas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/syntax_highlighting_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/winepadedazesusekina.pdf
    • https://cdn.shopify.com/s/files/1/0439/5981/2254/files/ciclo_evolutivo_de_ascaris_lumbricoides.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/548225123.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/iap_vaccination_schedule_2020.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_off00006318.bin
e949288947a71b7b88d70d9f36fb29dfdd0cc31eada0f72a7e5a19c2ba12a558
pdf-font-stream PDF embedded font (sfnt) at offset 0x6318 5064 bytes
font_01_sfnt_off00007436.bin
a7386cdc04631ebf8a1a8e4a14853c9e9d3e228c3af4b2419b412640481d8efc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 11828 bytes
font_02_sfnt_off000098f3.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x98F3 4324 bytes