Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a820b2c1035183c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-01 14:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9615d938777cbda6e0f11456a517f83 SHA-1: 6f7757cd7ff9c2bbf6f5858ed9911bc70249b495 SHA-256: 2a820b2c1035183cfa37188a67fef0a1345ce30332617cd8df87805e6721856a
154 Risk Score

Malware Insights

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

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 document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=square+root+matlab', indicating a lure to a malicious site. The PDF SEO Link Farm heuristic suggests a large-scale effort to distribute malicious links via PDFs.

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=square+root+matlab
    • http://files.phillipsmathandphysics.com/uploads/1/3/1/3/131398362/rapubusalawif-potikoratum-gakada-kibamopivasigev.pdf
    • http://files.elkhornvalleyhrc.com/uploads/1/3/0/8/130874612/8397628.pdf
    • http://files.minniemightietopics.com/uploads/1/3/2/7/132740594/tapelap_kamiwotonuwis_zogonorune.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/bezeromebezusigel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/57559928811.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/vinugeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/32709923770.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/kisolubatipudi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/70531730461.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/rotibazudel.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/95197592152.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4880/files/39496258783.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40814320730.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_off00005e31.bin
6d48db046a1e1e0dec98cb2c45dbdc0da48706602e6e0c4ddc7bc8781ddb77fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E31 5024 bytes
font_01_sfnt_off00006f31.bin
1601998811bdd84cce529a1d2259a37b30b5ebc6c501fe37ee0ed4f0c252924d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F31 13264 bytes