Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15d0767b276aafa…

MALICIOUS

PDF

54.6 KB Created: 2020-08-06 13:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edee55704b6c476e6349ffaedf1cd985 SHA-1: 32ada6c41d6b1a007f8bc15c9e8d94a4fbfe7095 SHA-256: a15d0767b276aafa3bdd384998aefd59eb14aa52b2de3db8c453ae1a57113499
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a PDF download and a URL that appears to be part of a link farm designed to attract search engine traffic. The primary malicious link is https://ttraff.cc/pify?keyword=how+many+countries+in+the+world+2020+pdf, which redirects to other content.

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=how+many+countries+in+the+world+2020+pdf
    • http://files.trinitysleepyeye.org/uploads/1/3/1/4/131406269/7714326.pdf
    • http://files.thewillowtreegifts.com/uploads/1/3/0/7/130739937/2d20eb.pdf
    • http://files.belfastsashwindows.com/uploads/1/3/2/6/132681026/najanutijidubodofiji.pdf
    • http://vifef.seratrevor.com/uploads/1/3/1/4/131453574/nefeduk-vugotudeb-fotireras-woges.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/xovozibakobopunadorup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/53977597034.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/16547358147.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/introduction_to_management_science_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8767/files/kid_cudi_indicud_zip.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5798/files/gimilurekiliduwuxug.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/how_to_change_text_color_in_css.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/30180402273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/9162405925.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/95433367383.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/ccna_1_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/3297/5272/files/mawidevisiwaxupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/xagudopoxenavafotosaxixet.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_off00009621.bin
a6a246add7d282027c94eed9148e8649b2a9c2d4d0e83c79949bcde016b3454e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9621 5824 bytes
font_01_sfnt_off0000a9dc.bin
e0a1670178c0e55b599806e8132cd3529b1c360b30f8e2ccf5a49913c059ba5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DC 10224 bytes

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