Malicious PDF — malware analysis report

Static analysis result for SHA-256 da236a1da75e2467…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 14:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11cf5f643a999e87cb6dab4b2701362 SHA-1: e30242ba67e0d2f208f8b70467b1594c1fdd3e9f SHA-256: da236a1da75e2467c33d800704f05d66acf2c57334cc9f985b0629028e9cafb6
152 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 one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a "self appraisal form" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness.

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=self+appraisal+form+in+punjabi+pdf
    • http://files.yellowdaisycourt.com/uploads/1/3/1/0/131069904/vebafe.pdf
    • http://files.tropicalcuracao.com/uploads/1/3/2/8/132814097/e2d70f35962e09b.pdf
    • http://files.bnmta.org/uploads/1/3/2/7/132740541/nemudunepinapa_zasimuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8151/files/jawefadexepu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1189/files/meek_mill_chiraq_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/depiduwitoxazinajelix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/7613210781.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/jinerisozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/lisita.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/sogiwafowuporokip.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/ranowew.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/23631881817.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/rizinujowegujinomowuvupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/nokufipojasojikajojanupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/application_form_samples.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/34851670759.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/
    • https://cdn.shopify.com/s/files/1/0432/1152/2

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052af.bin
566489da4d76a3e6b366843a27e0393aef569942d52e075fd891b559de3e3243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52AF 5508 bytes
font_01_sfnt_off00006547.bin
5002d454ecd6548824c704160d6780c7a551ff3ad1395be4fc92db623995a411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6547 5352 bytes
font_02_sfnt_off000078b7.bin
b44fedfb67ca69147ccfa89a5d048af2cbff04297b2749b5e8a71329bb63e4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B7 10008 bytes

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