Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee12b412e25270b…

MALICIOUS

PDF

44.2 KB Created: 2020-08-20 18:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f48f2750b5df7ca3b140cd0a6afc76b6 SHA-1: a989c83a4c6125fb34c8f7994be192ad766c3c82 SHA-256: 7ee12b412e25270bba915fc63a7ed20dc5357603a7f70c2549655862897e93c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=brothers+song++sapna+jahan'. The ML classifier also strongly indicated maliciousness. The presence of numerous links suggests an attempt to drive traffic to potentially malicious or spam-related 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://ttraff.ru/pify?keyword=brothers+song++sapna+jahan
    • http://kiguxaden.olvsf.org/uploads/1/3/0/7/130776167/5035683.pdf
    • http://files.camarillochamber.org/uploads/1/3/0/7/130776578/a8940658a39.pdf
    • http://files.misspatsyspreschool.com/uploads/1/3/1/6/131606222/c28faa2.pdf
    • http://files.cementx.org/uploads/1/3/0/7/130740231/1345155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/30587428731.pdf
    • https://cdn.shopify.com/s/files/1/0458/5432/6937/files/formel_1_boxenstopp_zeiten.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/23210508335.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/jokuraxelenasuzuvizeba.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/class_12_rbse_biology_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/77598918502.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/fugusogopavifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/1908762309.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/bacteriologia_y_micologia_veterinaria.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/93812918256.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_off00006255.bin
75531b8bfd7693c0ae754f878b5201e08a799bc21bc754def12341d2c7ae836b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 5172 bytes
font_01_sfnt_off000073f1.bin
03199fa16cb72e591c0b5fac3e4261e0ee36a69bbc6736305cdb3287e8629b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F1 9816 bytes
font_02_sfnt_off000095b6.bin
783075ef8e6df6cf0eefaa9c488a5e15e452beb1dd88a24ddb8559dc50583677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B6 3680 bytes

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