Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf50d81d5be5e89…

MALICIOUS

PDF

42.4 KB Created: 2020-08-18 12:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f904fd4101d0b89e5747e250a989d6da SHA-1: 3c8945e8029decf20ca17d3a83b8ea4163b018f2 SHA-256: 7cf50d81d5be5e899984f847c43c30126577117605863f27ba809aa45e439eff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for further malicious activity.

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.com/pify?keyword=potential+transformer+definition
    • http://banavew.emmettgallagher.com/uploads/1/3/1/3/131380213/dozosidozizeta.pdf
    • http://files.suffolkartleague.com/uploads/1/3/2/6/132695408/e16e4f9d39b822.pdf
    • http://files.thespeakershop.ca/uploads/1/3/1/4/131437532/tiluvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2197/5197/files/32203992812.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/wejafuvubel.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/fm_21-_75.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/zogir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/anyconnect_ordering_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/spatial_reasoning_11.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/bofobuborunigewotak.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/succession_planning_template_family_business.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3034/files/access_fine_location_permission_android_6.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_off000069f0.bin
72402f2fa0e99d7426e9af94542783057ab5bab017a01fe395d84dfcaad73b5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 5052 bytes
font_01_sfnt_off00007afd.bin
d1c9bbaf8e97ce5a54c3bc47294e9709f80e96f03442504fd2c1e0033d8705e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFD 10040 bytes