Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac530b32f439a11…

MALICIOUS

PDF

42.3 KB Created: 2020-08-23 03:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d650c73b9aa853f7d4d57194d8fc9e76 SHA-1: 0ba129aa60ecc7946e5c5d12c6dcd087a39b88da SHA-256: 8ac530b32f439a11e1c68640d4570e297c93e44377db943d5db5d6d302e7311a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The document body, though partially corrupted, contains text related to 'adding fractions with unlike denominators guided notes' and the malicious redirector URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a mass external PDF link farm.

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.ru/pify?keyword=adding+fractions+with+unlike+denominators+guided+notes
    • http://files.outoftimedesigns.com/uploads/1/3/0/9/130969151/dogatunu-zuxega-wepojiteworimod.pdf
    • http://gipagal.lethbridgeelectrical.com/uploads/1/3/0/7/130776783/079b902.pdf
    • http://files.greeknificent.com/uploads/1/3/1/6/131606027/lalepoxisodifa_nilosepoluwofe_fotonelubeki.pdf
    • https://cdn.shopify.com/s/files/1/0427/7442/9852/files/didojoxad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/74927473328.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2163/files/rafafulinizivubukapi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8722/3198/files/clicker_heroes_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/bufajazikemumuroguvusujer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/vizowetoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/zisixosasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/5722636601.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/business_plan_project_for_mba_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/2846/3271/files/cirrose_heptica_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6985/8214/files/antakshari_songs_list_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/gafaguwuduxamujuj.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_off0000661f.bin
bec1b19fef42914a9fd98033e7c578a3ab781bcf43fda7e6b04c738647f7afb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661F 5580 bytes
font_01_sfnt_off000078f8.bin
0a37f0d6726f5a0bfb2fb654b9abb9a9a7acae3a3fc98f8c4ecf089bbea21863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F8 10272 bytes

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