Malicious PDF — malware analysis report

Static analysis result for SHA-256 145a90cce8698e44…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 02:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 501f042978e8df3544adf4dec7cb22bc SHA-1: dca5cfe807b2e927ee016e3e7efcb4b257349f2d SHA-256: 145a90cce8698e44c7d317a9ae580fdacf7458654d109020da358586969de418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, 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 several benign URLs, suggesting a lure to disguise malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

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/wix?keyword=pdf+seiten+nummerieren
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/icse_maths_textbook_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/89137547625.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7112/files/95659345713.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/58524018012.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/72466376321.pdf
    • https://static.usrfiles.com/ugd/585b1d_2fb3575aad304bb68f52d2882b920f79.pdf
    • https://static.usrfiles.com/ugd/34e21e_72a79e5d7443424d854dcd50aa153305.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_4fecaaf5105d406ba678e2cd4c46a166.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_51667dfdb0f2408c99f5496248e38dfd.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_09a07265b6274ebba5f96f7f73fee7c3.pdf
    • https://static.usrfiles.com/ugd/3826db_da173772c4ae4c43a3faef17d8c17292.pdf
    • https://static.usrfiles.com/ugd/599f1c_e90f96cdbc8e46d284d787b2459a53c4.pdf
    • https://static.usrfiles.com/ugd/51c472_703b3ce3c33643a48aa56eeb3aaaa9d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_48b2e71ff8a64df9980993670fce4542.pdf
    • https://cdn.shopify.com/s/files/1/0463/8962/4987/files/girl_guides_of_canada_member_zone_login.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/wifatomesorejifuboduzepu.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/binomial_coefficient_properties.pdf
    • https://cdn.shopify.com/s/files/1/0449/6611/7544/files/oxford_dictionary_vocabulary.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_off000061f9.bin
aea0e0631526fc5ada1fff79bda5f2f6aee2cbe3e87a0b217b4a3d68b7902348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 4812 bytes
font_01_sfnt_off0000723c.bin
387243ec59070c2e4eb62dbc1491425fdcc1ccd4adb34c0c69e9c6c7909b9f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 10868 bytes

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