Malicious PDF — malware analysis report

Static analysis result for SHA-256 041631032f15d45c…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 01:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5756f858941a74275591074be4e1a3a SHA-1: d0ff62ef85ad15ed841dc6fb6dc9f24aaad63c7c SHA-256: 041631032f15d45c7ac261e44c13336e05864396ab5fd6e5c420829d4b854e0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to lure users to external, potentially harmful, content.

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=atp+us+open+draw+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/5099/5605/files/facebook_pixel_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/nivorirogexewogeba.pdf
    • https://cdn.shopify.com/s/files/1/0438/2693/8018/files/sikalastic_152.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/nabof.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/zowixaxapetazefug.pdf
    • https://static.usrfiles.com/ugd/87fdc7_3866fee6bfb246229956aa938f8e53de.pdf
    • https://static.usrfiles.com/ugd/696b8a_44a38017ab9647f79bba6dd214adef25.pdf
    • https://static.usrfiles.com/ugd/e2c250_31874bbba75748f9b0e352ac522096aa.pdf
    • https://static.usrfiles.com/ugd/a86d68_e83897adbce3402b9396d7e32eb4831f.pdf
    • https://static.usrfiles.com/ugd/10e3af_c7bdfc3772ca48ac977924816a0e94af.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/jafegifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/9867829238.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/kebaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/sarawak_government_almanac_2019.pdf
    • https://static.usrfiles.com/ugd/912de2_105e22ca40ad4e9a96f72e1fb4a56588.pdf
    • https://static.usrfiles.com/ugd/8b2c09_9a324392a3de4b028c1830c5b08ec781.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067cc.bin
f3ba6b1a35476f9a3c0f31c66bd03893fdd51a210a5112d36de48c60be3d8565
pdf-font-stream PDF embedded font (sfnt) at offset 0x67CC 5084 bytes
font_01_sfnt_off0000793b.bin
edc59026faf536fd81d506675dcb880b7ff9a6a068221bbbe10f77f5bb928e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x793B 10032 bytes