Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c69f9cc8533f2d…

MALICIOUS

PDF

42.0 KB Created: 2020-08-22 17:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d0780e503871651da388413d56645d6 SHA-1: f42010714628c789f7c0def34fd4ac9c0d5a01e3 SHA-256: 90c69f9cc8533f2d494e94c643390c5d4b1a69180e10e8f05a9f9f082844488a
152 Risk Score

Malware Insights

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

The PDF contains a lure related to 'sheet music' and embeds multiple links. One critical heuristic indicates a PDF redirector link to 'ttraff.cc', which is known malicious infrastructure. Another heuristic identifies a PDF link farm, with many links pointing to Shopify domains, but the primary malicious indicator is the redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated but contains the redirector URL.

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=duel+of+the+fates+sheet+music+easy
    • http://loxufojev.rkspeech.com/uploads/1/3/0/7/130776716/bf52330.pdf
    • http://files.qcfearlesslife.com/uploads/1/3/1/3/131380600/vedel-wuzelob-kovebon.pdf
    • http://files.experiencetravelin.com/uploads/1/3/2/7/132711983/zuboxutozatevipowuso.pdf
    • http://xanuja.scottyjracing.com/uploads/1/3/2/7/132710621/6ee44e3.pdf
    • http://rozekubi.novelideasbylaura.com/uploads/1/3/1/4/131437792/tofamemevetivureg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/olaudah_equiano_slave_narrative.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/zafade.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4405/files/ascii_and_ebcdic.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/setting_aside_arbitral_award.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/lajibimexoretanemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/6957606606.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/xaxalikinus.pdf
    • https://cdn.shopify.com/s/files/1/0466/3371/3829/files/acca_reinstatement_form_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/3096/2588/files/nebezokanitanamokepasotu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/60188199778.pdf
    • https://cdn.shopify.com/s/files/1/0437/7821/1991/files/the_instant_economist_download.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_off000064c4.bin
312ab030e00f934807c7af96dd550908dcb20207cc1bb2595b419cd0593618c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 5128 bytes
font_01_sfnt_off00007623.bin
e4c9835d25bd115b3341905e657ff3c5e6f54af16c44ed037bfafec73d2c0b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7623 10720 bytes

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