Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdcc3cf498f8cd8…

MALICIOUS

PDF

34.0 KB Created: 2020-08-01 07:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7a196a9d825502854014d20e2da201 SHA-1: 38d20162286788c93da8487484c9229262023927 SHA-256: 6cdcc3cf498f8cd8445b853ee08292484fbbb91815b0774867159761b9ad131b
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a tutorial for Autocad 2013, likely a lure to encourage users to click the malicious links. The presence of a large number of external PDF links, many benign, suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=autocad+2013+tutorial+pdf
    • http://files.porthcawlmuseum.com/uploads/1/3/1/4/131437683/4183767.pdf
    • http://files.augopet.com/uploads/1/3/1/4/131438869/9bae0f.pdf
    • http://files.flyingcoloursmusic.co.nz/uploads/1/3/1/4/131410939/jiwojalava.pdf
    • http://files.atascocitacg.org/uploads/1/3/0/8/130814208/lavelibe.pdf
    • http://files.dublinwritersretreat.com/uploads/1/3/0/7/130776630/bowufiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/bamiwunodefaxoluximagu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8845/3533/files/62627366589.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/tagomojoteg.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/40715070878.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/83537836258.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/36871708543.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/18884539449.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/pekopudonefuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/83832084151.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/71670963278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugasodaliza.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/xedomoragaxalotit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.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_off000047f1.bin
3957d723d8bf017c3808e15f369744f3ed9a924c6ff22d176bf9c2c72e48b244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47F1 5448 bytes
font_01_sfnt_off00005a97.bin
bc543f33c3f883a46affe07c92361b7ec086f522b0bc124faf5c21b35a9e64c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A97 9516 bytes

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