Malicious PDF — malware analysis report

Static analysis result for SHA-256 3793b40d3bdc65d0…

MALICIOUS

PDF

49.4 KB Created: 2020-08-12 17:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b92e2c4803e50877f6efd07795e493e3 SHA-1: 542456f4949c4c3c53beb2a9ae09d111acb1daa6 SHA-256: 3793b40d3bdc65d08ae8ffaa0d560c44e360e6727ee0995e1153afad05ba7575
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but the primary link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Introduction to germanic philology pdf' and the malicious URL, suggesting a lure to a malicious site disguised as academic content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=introduction%20to%20germanic%20philology%20pdf
    • http://files.roxbury5k.com/uploads/1/3/1/4/131408970/2952171.pdf
    • http://files.rockgardenapartmentspefkos.com/uploads/1/3/0/7/130740517/zomagelujudeme.pdf
    • http://sefozevi.cpsschoolcounseling.com/uploads/1/3/1/4/131452883/gagafesegetavez-jowiz.pdf
    • http://files.drsusankentarce.com/uploads/1/3/0/7/130775649/wabividavibomedux.pdf
    • http://files.deekincade.com/uploads/1/3/0/7/130740069/7955382.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/gapumilajixonufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/pufarokofinagonopo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/90786537258.pdf
    • https://cdn.shopify.com/s/files/1/0429/1333/3411/files/libesizimowofajomesabive.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/84431210863.pdf
    • https://cdn.shopify.com/s/files/1/0440/4166/6710/files/37701017825.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/sanot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/zakinod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/94754057580.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/zokivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/durokazujogezasugoral.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/50607636565.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/a_handbook_of_pronunciation_of_english_words.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007167.bin
4d5ba72cda2dd177f86f2e172be9cb7fbb64dab77a3588eab0e46fa51882d575
pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 5428 bytes
font_01_sfnt_off000083bc.bin
6f2877f3709e55b3a62dfa47c2a517a2bfcd7f2e772c75b83f263fbbdc74a7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BC 16468 bytes