Malicious PDF — malware analysis report

Static analysis result for SHA-256 20283816edea98d9…

MALICIOUS

PDF

42.1 KB Created: 2020-09-09 22:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3780f8f8e21ca32d1080206b474831fb SHA-1: 25257a315806e28476ca1d7581a2c8d3cd2c1e4a SHA-256: 20283816edea98d9763acc676c1e9f903c10629635b1f689fc07c399ab7cabe2
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, identified as a PDF link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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.club/wix?keyword=hawkeyereport+forum+basketball
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/dituxuvenuti.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/fundamentals_of_organic_chemistry_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8796/files/jumedegeza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2967/files/one_block_wonder_quilt.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/tifakasijozapug.pdf
    • https://static.usrfiles.com/ugd/f103bb_7c092fa2fcde47a2a6811c2f45109ddd.pdf
    • https://static.usrfiles.com/ugd/a76634_d09bcbf34f62467e8e853046d06b6b35.pdf
    • https://static.usrfiles.com/ugd/9d869b_671d6f3d38a1416d990ac33cb73f68d1.pdf
    • https://static.usrfiles.com/ugd/f46427_a9c80e4432ee4fcbbab2d0c6062bfb51.pdf
    • https://static.usrfiles.com/ugd/510691_bfa9ba282cc549aabfbc55a1f4806d2f.pdf
    • https://static.usrfiles.com/ugd/b96e41_5cba5396702b462dac9f7d7a3dd03d64.pdf
    • https://static.usrfiles.com/ugd/bc0d1e_cf40cb44c6044960860ffbcb513a49bd.pdf
    • https://static.usrfiles.com/ugd/544c7e_38b0dcef264545fca926e2ae499dc57a.pdf
    • https://static.usrfiles.com/ugd/cf79db_219756f3351746a4b6584e7cbc526668.pdf
    • https://static.usrfiles.com/ugd/cd1d52_06fc62b7db754fbab66827d112f78b11.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_54bdb27b4be549808393a4b130e8c137.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_off00006669.bin
eed605bb93b21f046d145bb3c798a6eb92f49d7ee18bf8aedc3731204504f6ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6669 5404 bytes
font_01_sfnt_off000078cd.bin
5b0d0098f0a117126fa8c7603b4d05558a48ffa3fb68e8f28def77b08a26d3f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x78CD 10164 bytes