Malicious PDF — malware analysis report

Static analysis result for SHA-256 83418cc7b9d22b76…

MALICIOUS

PDF

43.8 KB Created: 2020-08-23 05:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d146e416d04b61875f995599765780 SHA-1: 884cd88460344cc55d32bf6cea6fee120fe02697 SHA-256: 83418cc7b9d22b7661fd06c89d91c07bc15b24f1785cb236d034bbdef7c2648d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=glandula+submandibular+inflamada+pdf', which is a critical IOC. The presence of multiple Shopify links suggests a link farm used for SEO poisoning to lure victims.

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=glandula+submandibular+inflamada+pdf
    • http://jetunax.calaverasarts.org/uploads/1/3/2/7/132741100/3500105.pdf
    • http://files.kwaniwinder.com/uploads/1/3/0/7/130775084/9480552.pdf
    • http://files.artistbrittneyg.com/uploads/1/3/1/4/131437889/japimibazi.pdf
    • http://kemipemi.theoffsideflag.com/uploads/1/3/1/4/131438759/23533.pdf
    • http://mesiwamad.kcldentalsociety.com/uploads/1/3/0/8/130874540/9082146.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/pafozirez.pdf
    • https://cdn.shopify.com/s/files/1/0430/7491/2410/files/gebixorekasonegip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/lomuragusaluxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/22736120140.pdf
    • https://cdn.shopify.com/s/files/1/0429/5901/2006/files/57080602155.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/95266770591.pdf
    • https://cdn.shopify.com/s/files/1/0430/9290/2039/files/nexixanuwipemiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3090/files/vodugos.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d7f.bin
f9b09dc9d2875cb23a17ad0fcc6a4653ac7d9eaa56d1a1ef4a92d5354a387955
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7F 5356 bytes
font_01_sfnt_off00007f96.bin
db019dab9a0f615009c1efe025aa00ed71a6a905cae9c8fbc88ec6b7455ef670
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F96 10272 bytes