Malicious PDF — malware analysis report

Static analysis result for SHA-256 874bbaa10db58494…

MALICIOUS

PDF

49.8 KB Created: 2020-08-09 11:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e382a457027c067e2384c8627b944808 SHA-1: edd5d274aee9c468f8bbd82ef2fa92cfe2570eaa SHA-256: 874bbaa10db584944629a19a0d2f7d8d0f7ff1607928fbd3b2f489ab8fdb133d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text related to splitting PDF documents and includes the malicious URL. This suggests a social engineering lure to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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=d%25C3%25A9couper+un+document+pdf+en+plusieurs+parties
    • http://files.goldenplatinumtips.com/uploads/1/3/2/6/132682329/3016115.pdf
    • http://kosofosa.plaiconsulting.com/uploads/1/3/1/3/131383483/5512730.pdf
    • http://suzad.ppcomachining.com/uploads/1/3/0/8/130874359/9077974.pdf
    • http://files.oldhamcountypolice.com/uploads/1/3/0/7/130738799/viniginonidow-nafemumosekijer-fejesizufirafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/rekujilekegirenaxorigis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/3360488319.pdf
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/10535414907.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/pneumatic_cylinder_calculation_formula.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/theories_of_entrepreneurship_education.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/45466806383.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/98106753611.pdf
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/91242296231.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/23483507070.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/zakixuveluwakoruteju.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_off000072bd.bin
a691755b800a4900faa0f0759e335d36543b75ba01849f28894ab28abf4bdaf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 5324 bytes
font_01_sfnt_off00008477.bin
aef3de277d23d9597ea3684c135ee5f880c516df30f36825715ad46c80cd556f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8477 11952 bytes
font_02_sfnt_off0000a9f9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F9 4324 bytes