Malicious PDF — malware analysis report

Static analysis result for SHA-256 83417e754fa8264b…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 13:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25dab059e72651995cbb7bdc2c457c0c SHA-1: 51199b1f4807704c75d3cc5c62ea14d8463db961 SHA-256: 83417e754fa8264bd1b3706202b9c8ae1aa834cf1996dfad7d60f2f6490f0bea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs and one critical link to a known malicious redirector at `ttraff.me`. The document body, though heavily obfuscated, contains the text 'Linkway s2 modem manual' and the malicious URL, suggesting a lure to trick users into clicking the link. 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.me/wix?keyword=linkway+s2+modem+manual
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/bracing_in_steel_structure.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/60191806181.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/forrest_gump_music_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7093/files/jewasabefoseramike.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/kaxefatofinipotopide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/disademibupaleg.pdf
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/xaveporoxibu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/5167393085.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/52955053131.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/70663346844.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7358/files/89016668701.pdf
    • https://static.usrfiles.com/ugd/b8c837_25b8f540408a48219d9e3c2ab14e0c74.pdf
    • https://static.usrfiles.com/ugd/e1c37d_ed2e03543d25495ab22fd270fae054e7.pdf
    • https://static.usrfiles.com/ugd/451a43_5b7f378526ee48a7853dc43d8a51d199.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_off000061a4.bin
601b0be00a9c1f7800289ce7ba2d1cb787c798dedb0eab2be83fc2bff319e9d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A4 3036 bytes
font_01_sfnt_off00006c6d.bin
52122822cfed5219ed193f7692540d667239eaf672deb9ab389a33e498bc6424
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6D 5204 bytes
font_02_sfnt_off00007e36.bin
281cf71b4b88a98ce0252864c016980f41ef68ae42efc19cf12e640eabe5c691
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E36 15096 bytes