Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc84b1cbadeb4203…

MALICIOUS

PDF

44.3 KB Created: 2020-08-16 23:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1daa2ba6360771fdc4b9320fd285a946 SHA-1: 7cb44ff8584716271fcc0075dfde48c914d927bf SHA-256: cc84b1cbadeb42033ed434ebeb2128b41791258f46d7d45b83463a60ff704988
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=hidroxiurea+anemia+falciforme+pdf`. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external sites.

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=hidroxiurea+anemia+falciforme+pdf
    • http://files.pinkcheeksbymadeleine.com/uploads/1/3/0/9/130969700/63c5efe8.pdf
    • http://fumok.silentxc.com/uploads/1/3/1/0/131070178/wevuvi_xomomeperum.pdf
    • http://somudupu.timbstechtalk.com/uploads/1/3/1/4/131407117/5439c4.pdf
    • http://fukifavi.shopcottonandcactus.com/uploads/1/3/0/7/130740019/xoribipegiliw_jogirokapubu.pdf
    • http://files.childrenssunflowerhouse.net/uploads/1/3/0/7/130740480/sulogaxidelu_minuror.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/wudaxavutixex.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/52724923273.pdf
    • https://cdn.shopify.com/s/files/1/0430/9198/4535/files/41763264018.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/kutadaxebozokufibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7145/4883/files/23662783281.pdf
    • https://cdn.shopify.com/s/files/1/0431/1577/4108/files/suvugoxelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/11347146280.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/13441689442.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/bus_game_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/lumewetorozimibeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/attestation_d_affiliation_cnas.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/blank_page_in_ssrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/nowadofemerex.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_off00006e89.bin
59ae32109f96de8e705d5756e2517bd2ef2924763d0c943a8e321512e7068ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E89 5152 bytes
font_01_sfnt_off00007ffa.bin
62916de47e635a83a98434adc0dcfd45781103328e88928ebeec1efa1c79c299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFA 10808 bytes

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