Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b806a16b020e8bb…

MALICIOUS

PDF

44.3 KB Created: 2020-08-23 20:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d421c636079395f27ab313a7733f7d SHA-1: b323ea0b5c43a8857e5c4b7673456939fc6a5367 SHA-256: 7b806a16b020e8bb06cd66874442b44b6b40747315792c3dc6f2df84d5e4fb88
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'convert pdf to word android apk', suggesting a lure. The presence of numerous external links, many pointing to Shopify domains, indicates a link farm strategy, likely to improve SEO for malicious content. The ML classifier 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.cc/pify?keyword=convert+pdf+to+word+android+apk
    • http://xiwefilo.saeedcomputer.com/uploads/1/3/1/4/131453134/vefali_rizofa_vujupamalesowep.pdf
    • http://files.lockehavenfarm.com/uploads/1/3/1/3/131383602/kenuduzukukevit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/jufudumaxik.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/gamawojeguxavomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/wezenotulelagunabibuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/benim_hocam_fizik.pdf
    • https://cdn.shopify.com/s/files/1/0437/0520/4888/files/64551936637.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/drilax_drill_bit_hole_saw_guide_jig.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9792/files/99155902162.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/tobebamusogitonumizu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/fegubuvazaxawupemis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/tekotedigunuvedituk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/jafugaxiguvatubipifi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/onan_generator_emerald_1.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644c.bin
5774aaffa6308988ad012d85a6a1ca1984c5e28ba146d8755c6dda8bf20cebfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644C 4852 bytes
font_01_sfnt_off000074f1.bin
1f1fbff981aab633b34a911ad4e6f7beed2138cc6c734100af3405a2a07c4bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F1 9684 bytes
font_02_sfnt_off00009614.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9614 4324 bytes

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