Malicious PDF — malware analysis report

Static analysis result for SHA-256 421cb0de6b50fe2a…

MALICIOUS

PDF

46.4 KB Created: 2020-09-14 00:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde64e3740d9e63650fdd68fa908f3c5 SHA-1: 29da016feac975176b82353f533b55bbcec6d8ed SHA-256: 421cb0de6b50fe2a136bc2c201f33be2b0b01f3699dd0c6b5b5915eac7245762
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised within what appears to be a product review. This indicates a phishing or malware delivery attempt. The PDF also hosts a large number of external links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the presence of malicious links is sufficient evidence for this assessment.

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=lina+uv+gel+review
    • https://static.usrfiles.com/ugd/4c1554_984b53e629334ab6a496b4cefbc99c70.pdf
    • https://static.usrfiles.com/ugd/3b6424_e3561a883db74109ad613fc93e3f744f.pdf
    • https://static.usrfiles.com/ugd/df73ab_f98614cf5310499fb232e88d955c771c.pdf
    • https://static.usrfiles.com/ugd/a32c20_f0c2c62ea29143749747093d79d7a16e.pdf
    • https://static.usrfiles.com/ugd/850f07_418c56756c224378bad0dadfd9b6f898.pdf
    • https://static.usrfiles.com/ugd/b18e4d_a62209117fac48df8506e1a02e5b3e36.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_000584252c054cbba0507eaa4c7075c5.pdf
    • https://static.usrfiles.com/ugd/72216b_2474c98668e748f0b912240531fdce41.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/95930581558.pdf
    • https://cdn.shopify.com/s/files/1/0462/3230/5813/files/jufutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/bahubali_movie_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/gst_all_tax_list.pdf
    • https://cdn.shopify.com/s/files/1/0460/0443/7159/files/best_app_er_for_laptop.pdf
    • https://static.usrfiles.com/ugd/dad7b5_50d481ad2d754413bec836940a55e355.pdf
    • https://static.usrfiles.com/ugd/ccf397_faf28dd9eaf440dab82d24239d9b9104.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_off000077f5.bin
fcd17aba3b408afd4ca9b85310afd5a45f66224d2ae3c1dab82de657ac68b5e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F5 4768 bytes
font_01_sfnt_off00008856.bin
e1631f3e1c75ddd222efeb45e172f9c79a42292c711b3beeff5d5e38d04d4dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8856 10592 bytes