Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aaa907bbf3fdf7…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 20:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31378da5b3f67e203f7a5c55ef249522 SHA-1: 83b67d78592468919028e7a6df377ee614578550 SHA-256: 22aaa907bbf3fdf7a7d593d2e2e72eba79d340991f8a1dffe82933bfe8686748
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a suspicious one pointing to 'ttraff.cc', which is likely a redirector. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a tactic to obscure the true malicious destination or to leverage seemingly benign platforms for distribution.

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=analgesic+definition+pdf
    • http://rebaxif.tasteoftheseaport.org/uploads/1/3/2/8/132815123/efb55b1041.pdf
    • http://files.snkgng.com/uploads/1/3/0/8/130874012/3483191.pdf
    • http://files.wynedesygns.com/uploads/1/3/0/8/130813736/fixunakikokuwo-daloboku-kasozodafibe-koman.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/paypal_change_password.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/futikuzazojexopuvenewipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/gevisowug.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/zawevazowifawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/negonarufefozosaburesid.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/51220806204.pdf
    • https://cdn.shopify.com/s/files/1/0434/5374/3270/files/mano_buddhi_ahankara_chitta_ninaham.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/bukizexazin.pdf
    • https://cdn.shopify.com/s/files/1/0437/2076/9685/files/67483002817.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/nuzofijitog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/jifubisujosomepije.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/1/0433/0687/7080/files/negonarufefozosabur

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645e.bin
ed92e0c958a17e81c5d46f6a0a15baecbfca6a9db6cbd469e5b814e033fe05e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 5216 bytes
font_01_sfnt_off0000762e.bin
981e0752119ddcd24640b8b7158c83c24e7243e30e14e763c3eea0eeea502757
pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10188 bytes