Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdc0b1456d14209…

MALICIOUS

PDF

45.5 KB Created: 2020-08-15 00:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83dcf6031d792e32e8b3409410447e7 SHA-1: 8d7dcb8ca9dbf09e4f5bc10f62b5b78c09a83a1d SHA-256: cbdc0b1456d142099850b7fbfcc44828bb8c2dccbb61b59ae629ff3b13541619
154 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.ru, which is disguised as a download for a 'Gmc acadia 2014 manual'. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs hosted on various domains, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=gmc+acadia+2014+manual
    • http://files.lakehamiltonbaptistchurch.org/uploads/1/3/0/9/130969967/2639348.pdf
    • http://files.wonderful-morocco.com/uploads/1/3/0/8/130814636/444536701.pdf
    • http://files.sarahreed.ca/uploads/1/3/2/6/132681452/5192245.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/78991515462.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/22616007301.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/pabozuvevobudewaselubil.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1344/files/brendan_behan_the_hostage.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/42366097380.pdf
    • https://cdn.shopify.com/s/files/1/0432/7358/4793/files/255774338.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/donexite.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/47091822234.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/how_to_change_to_word_apple.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/metuvi.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_off000074e9.bin
4d70fed53d450ab3d72c5965baa7ebd0baec95c26f540e9494432402f12fd7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 5256 bytes
font_01_sfnt_off000086c1.bin
0677451fce955c9f0fa8563c02c5cf4204fcd58ecf16873a4ff2623bfe3ef5eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x86C1 10076 bytes