Malicious PDF — malware analysis report

Static analysis result for SHA-256 4276e6a54fa2d88c…

MALICIOUS

PDF

45.3 KB Created: 2020-08-23 19:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a854bfc8ff61dfe2b6b57aa84d982f3 SHA-1: c67cf8abc82d9b08047a111eff21649b7b523e6f SHA-256: 4276e6a54fa2d88c4b077611022e296095ea7829321041d78d6361f8efb4ad1a
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a known malicious redirector and for containing a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=tower+defense+king+android+1. While no scripts were extracted, the sheer volume of links and the redirector heuristic point to a malicious intent to lure users to external, potentially 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.ru/pify?keyword=tower+defense+king+android+1
    • http://dazotare.manisha-sharma.com/uploads/1/3/0/7/130775518/zexukexagirene.pdf
    • http://files.greaterhudson.org/uploads/1/3/1/4/131438420/mabebefixilemi_nibavoxopelaz.pdf
    • http://wijupig.spiritandtruthchurch.net/uploads/1/3/1/6/131637136/185677.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/mercedes_glb_2020_preisliste.pdf
    • https://cdn.shopify.com/s/files/1/0437/7119/9642/files/fuse_odg_azonto_mp4_audio.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/arches_national_park_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/kedezonovi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/29376874621.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/64509990277.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/7885766371.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6629/files/livajebax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9970/files/zonosaxeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zukax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/41478992435.pdf
    • https://cdn.shopify.com/s/files/1/0449/7958/5192/files/einstein_equation_derivation.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_off0000723d.bin
3ac34721a12192c5d096770990a57e882aff4ec2dc70752268242d8043f8e750
pdf-font-stream PDF embedded font (sfnt) at offset 0x723D 5200 bytes
font_01_sfnt_off0000841e.bin
e85b36a0d182d282d29d10d928c3de646a177ee9405630fc037b20f46b81fb10
pdf-font-stream PDF embedded font (sfnt) at offset 0x841E 10516 bytes