Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84778dac323f849…

MALICIOUS

PDF

33.0 KB Created: 2020-08-13 01:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9b6e963ed10e79dacbbe02b11618c5 SHA-1: 2cff3c2773790b1ea0e2e81467f8631df78d8e92 SHA-256: f84778dac323f84992f31a4548e34c4e04f671c10272045bdc2f2d19e7fa3a1b
154 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.ru/wb?keyword=asuhan%20keperawatan%20tumor%20tulang%20pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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.ru/wb?keyword=asuhan%20keperawatan%20tumor%20tulang%20pdf
    • http://buditatiw.blairiouspetsupplies.com/uploads/1/3/1/0/131070374/5179472.pdf
    • http://files.netherlandsandcoloniesrevenues.com/uploads/1/3/0/7/130739646/pinizonubelev.pdf
    • http://balol.doraziolab.org/uploads/1/3/0/7/130776158/temuwutikok.pdf
    • http://serez.hmongumc.org/uploads/1/3/1/3/131380505/0b0a0b7352044.pdf
    • http://files.gamesoundplanet.com/uploads/1/3/1/6/131606128/1440c4e9f92b.pdf
    • https://cdn.shopify.com/s/files/1/0434/2317/0710/files/55007442020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0301/files/sekiro_unrefined_sake.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/salajugikavafelewejojuwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/cephalohematoma_vs_caput_succedaneum.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/28302919523.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5074/files/datakitobej.pdf
    • https://cdn.shopify.com/s/files/1/0436/0237/8915/files/webegepigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/42625612006.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/17208712991.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5194/files/dinosaur_game_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/65605057235.pdf
    • https://cdn.shopify.com/s/files/1/0432/7607/5164/files/12059171198.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/vinerewowilanudizodez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/tabuwebipuredoj.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_off0000468d.bin
a2d4d2d5c9f3172178c68bb46a79d102ac9bab1b1cff3cefa1d7f5ca4ce23532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x468D 5600 bytes
font_01_sfnt_off00005979.bin
f9c2a6eccd29a877252b52694513bc3a4f453b3691e6bec1e5dca2845c1f03eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5979 8972 bytes

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