Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b9734a2a9c903…

MALICIOUS

PDF

45.4 KB Created: 2020-08-23 01:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e091354cca4a39e120c0be64c19d0bd SHA-1: 179aa9efdc8b9563adf516b219f05666607da3ba SHA-256: 927b9734a2a9c903a9a16e77773d60a4fdf3510aa5e395f668695f43dce41c12
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the text 'epileptic seizure pdf' and the malicious URL, suggesting a lure to entice users to click the link. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

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=epileptic+seizure+pdf
    • http://files.nebraskaena.org/uploads/1/3/0/7/130776081/sedumumeboja-zezutozig-duzojajedifa.pdf
    • http://zomegegi.shaypery.com/uploads/1/3/1/1/131164110/37eac1a2.pdf
    • http://firafago.persimmonalleypress.com/uploads/1/3/1/4/131407818/42f926e531.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/88400682734.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/59645152170.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/mlscn_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/64195251110.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/brain_on_fire_livre_francais.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7177/files/weber_dcoe_tuning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/manufacturing_processes_for_engineering_materials_kalpakjian.pdf
    • https://cdn.shopify.com/s/files/1/0466/2309/6997/files/82493825657.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/49388785725.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_off0000740c.bin
f6127fa6c671952d6276b4a20115c7ad445bd6d484b85af8bfec928093c83762
pdf-font-stream PDF embedded font (sfnt) at offset 0x740C 4948 bytes
font_01_sfnt_off000084fb.bin
bd14654138ff3842121e0faa8bfbe882ea4defcac9a6a4b26d3ca8b7e7293a32
pdf-font-stream PDF embedded font (sfnt) at offset 0x84FB 10596 bytes