Malicious PDF — malware analysis report

Static analysis result for SHA-256 7128ae0ae9a109ae…

MALICIOUS

PDF

44.4 KB Created: 2020-08-02 09:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c55ba55bda9356190b1248a11d78323 SHA-1: 3af8df9fd7f3afe74ad76877d43d5bb6e696a27f SHA-256: 7128ae0ae9a109aef692c6df8b798c6d105d5440b844b57529e8027481fcf3ea
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and credential harvesting. The document body text and embedded URLs suggest a lure related to password recovery for devices like ASUS routers. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm used to distribute malicious content or improve SEO for malicious sites. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing campaign.

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=forgot+asus+router+password
    • http://files.carpetcleaningmontreal.org/uploads/1/3/2/6/132681296/visawixa.pdf
    • http://files.utahcattlewomen.org/uploads/1/3/1/4/131452883/zanifoduta-leduwid-bixoxud.pdf
    • http://files.taniajanenaturally.com/uploads/1/3/1/4/131454373/lipikudura.pdf
    • http://files.tresrioshabitat.com/uploads/1/3/1/4/131407357/3167622.pdf
    • http://files.livingroomworkoutclub.com/uploads/1/3/0/8/130873840/bezijuxavas_vepusuvarefe_moviwuj_kuvixalawulet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/54712643518.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/bitiseka.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/danutavarijap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/belezin.pdf
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/52318868845.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/virtual_dj_pro_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/3827/6760/files/vozazolerixusadasab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/paruwedobixetuzumadakud.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/xafineda.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/nuzavebon.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/5836224642.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/how_to_check_spam_in_gmail.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/jidurevapavikefegulosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/71730603722.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006315.bin
d6d838eab12ee05efdc7077f2f0fb6e4e835d013210327f6979a9cae6c91fa8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 4872 bytes
font_01_sfnt_off000073ce.bin
4f9f8ec3ba0763fbbfe209f2754e72ab4d62bf29de247a9e0a843da44d33feb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CE 10060 bytes
font_02_sfnt_off0000962e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x962E 4324 bytes

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