Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35bc5b07f64eff5…

MALICIOUS

PDF

40.4 KB Created: 2020-08-17 13:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee98125e39468109f2c04cef4fe210a6 SHA-1: 22722ec849b76f003ffe4ab8f313e6e938a4733d SHA-256: e35bc5b07f64eff582f21ef1c461ac23af4b694c3d524257253f2ba8f54b8649
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same URL, suggesting it's the primary lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the malicious destination. 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.cc/pify?keyword=prefix+suffix+worksheet+5th+grade
    • http://files.shannonoconnorphotography.com/uploads/1/3/0/7/130775350/femebuzobibudip.pdf
    • http://files.crystaldull.com/uploads/1/3/1/1/131164402/kigobopitatuke-fiwexetagu.pdf
    • http://files.stjamestaos.com/uploads/1/3/1/3/131380899/nujurupepof.pdf
    • http://files.reneeheissart.com/uploads/1/3/1/3/131398224/1164212.pdf
    • http://gigowox.justneighborsvt.org/uploads/1/3/1/8/131856877/volutovagoker_wesufufakoxun_kaxoxefoju_vakel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/nefan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1956/6231/files/biology_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/nezojet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/situxojexuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/jijubikagaxofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/nesuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/37270892454.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/sired.pdf
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/8178930436.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/9668641692.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4687/files/13610650084.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_off00005f68.bin
5befe5e7a87df742c58b6ee793fb9fcd0edb4c95cabb00b2adee76bee5cf9ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F68 5484 bytes
font_01_sfnt_off00007228.bin
c517d68c06cdb30bd1d98698d04d69d74818faa893bb06e96e79577815d38257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 9980 bytes

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