Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a0d23a75b699d3…

MALICIOUS

PDF

50.6 KB Created: 2020-08-08 01:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 654171b096a2ab0739aeab08dabcd3f8 SHA-1: 019a342a6d026fc57b7751a3b27069d55d2a7700 SHA-256: 61a0d23a75b699d3344cae3eaeeea16d116019b6a0e1f37e841abcf794324ba3
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to "strength of materials formulas pdf". The presence of numerous Shopify links, many of which are benign, alongside the malicious redirector, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=strength+of+materials+important+formulas+pdf
    • http://wopaxus.theresalovesyou.com/uploads/1/3/1/1/131163590/kerudezaxerusu.pdf
    • http://files.sweetanniescreations.com/uploads/1/3/1/3/131382841/dazilagelagaz-giweweko-xezepupeg.pdf
    • http://files.geographywithmrsc.com/uploads/1/3/2/6/132696029/4329541.pdf
    • http://files.allcaptainsmobilemarine.com/uploads/1/3/0/7/130775448/5570762.pdf
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/bass_guitar_first_lesson.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/mesezu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/weraririfigup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/60637468839.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/89654686419.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3152232763.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/1635953770.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/curry_blake_healing.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/41889473156.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/25272221063.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/63344847278.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/lesson_plan_in_english_literature.pdf
    • https://cdn.shopify.com/s/files/1/0437/5943/5928/files/82828052303.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/segawulajax.pdf
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/piscicultura_tilapia.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_off00008774.bin
f3257b944087286dc724fc39246c95f1bfdb8f7538210cfdafd8d2502523f890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8774 5560 bytes
font_01_sfnt_off00009a2e.bin
41544cd4cb71d7b0ff1a24b4c756db29bdcde4f6df4a699feab6eb7e94d1b109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2E 10264 bytes

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