Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac850fea53aeda1…

MALICIOUS

PDF

42.5 KB Created: 2020-10-07 17:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a691d196435d9391cb55c090554813af SHA-1: a0b726eeb87e88fcb1e91ff2aa9bdb5d4d6ec361 SHA-256: 8ac850fea53aeda1852bd8f2e0b68ba8c724e3a92966d86f498acc3354492328
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet answers' lure, which is a common social engineering tactic. The primary malicious URL identified is https://cctraff.ru/pify?keyword=classifying+real+numbers+worksheet+answers, which is likely used to distribute further malicious content.

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://cctraff.ru/pify?keyword=classifying+real+numbers+worksheet+answers In PDF document text
    • http://files.ulcdc.org/uploads/1/3/0/9/130969140/pezogexijuxam.pdfIn PDF document text
    • http://majodoti.delrayvillasplat2.com/uploads/1/3/2/7/132741155/gorijudufipik_lekubajowelu_mogoxosapoga.pdfIn PDF document text
    • http://files.canyonyearbook.com/uploads/1/3/1/6/131606254/rotuxavi.pdfIn PDF document text
    • http://nepomeses.re-chargers.org/uploads/1/3/0/8/130874493/7316146.pdfIn PDF document text
    • https://site-1043809.mozfiles.com/files/1043809/bukujekarapun.pdfIn PDF document text
    • https://site-1038844.mozfiles.com/files/1038844/tisisiporawopo.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/48444534389.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/nba_live_mobile_hacked_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/7102638572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0165/9559/files/30027017893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3832/4374/files/pankration_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/rita_on_dexter_annoying.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/62153726744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9709/0967/files/73073456898.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6722 5484 bytes
SHA-256: 22af0ba12279a4f7b358140912fdf43aa52f7b0928971f0e539c5523fb5cac31
font_01_sfnt_off000079b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 10140 bytes
SHA-256: d038bb2b0ecaf84266f83bd60ad346b6030cdd1a8955139e3d7df9e50092d0f4

Open this report in the interactive analyzer, or submit your own file for analysis.