Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd453c2cd875ace…

MALICIOUS

PDF

43.7 KB Created: 2020-08-05 23:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1c78d444e5d83d82f524faaaaa12ec SHA-1: 8f888ef86db12224bac9f39d87ad349fcf7b6bed SHA-256: 7fd453c2cd875ace70c225e212421772c457a4fee36eb611f6e1ce0a63320df6
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise its true purpose. The ML classifier also strongly indicated maliciousness.

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=komplikasi+abortus+inkomplit+pdf
    • http://files.designingthesustainablesite.com/uploads/1/3/1/4/131453577/d627f9f337.pdf
    • http://nugusej.splfairmont.org/uploads/1/3/1/3/131383664/1412359.pdf
    • http://files.reference-press.com/uploads/1/3/1/4/131454151/5603374.pdf
    • http://files.gene-switch.eu/uploads/1/3/0/7/130776366/2301152.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3365/6476/files/relizaxaguxazobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xasaxikopakepiditewevumub.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/kexigemifijedodo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/jetox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/agricultural_science_study_guide_grade_11.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/angelic_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/1009/files/97400061001.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0430/4551/9513/files/lobekusawosen.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/99803414378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sagomowaroperovi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/briggs_and_stratton_repair_manual.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_off00006be7.bin
235c29c39710052115b0b0b06d4965769684fb030781d998f2ff61bfc228652a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE7 5360 bytes
font_01_sfnt_off00007dfb.bin
1765de67e6f974ff334330cd5d7ef4820977c07942c0254f0db5437ad10aa9cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFB 10372 bytes