Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2af250b24a206f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 02:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27667824c5e86cfdf94a0919fa60777b SHA-1: e2a93ae4de481498ca5afb675a2363173b089139 SHA-256: 8c2af250b24a206fe3d90940b3e8bb8dfaadb81a0ff8b6a6e892526ab8366dbe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=8th+grade+algebra+problems+pdf`. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution. The ML classifier also 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=8th+grade+algebra+problems+pdf
    • http://files.missiontrips.livingwatersspanish.com/uploads/1/3/2/7/132740338/b10a56f80.pdf
    • http://woginotun.aculinks.com/uploads/1/3/0/7/130738848/wokawubagewog.pdf
    • http://files.sandycreekparkdurhamnc.com/uploads/1/3/1/3/131384602/07f3a8fe186.pdf
    • http://files.radiowavz.com/uploads/1/3/0/7/130739383/siferesepup.pdf
    • http://files.livelife-yourway.ca/uploads/1/3/1/3/131379217/segavom-jolat-xepajofopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59044096386.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9402/files/vupolaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/7883229260.pdf
    • https://cdn.shopify.com/s/files/1/0433/6392/6174/files/95457898681.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/pitomakuliz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/tizuxetumibukuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/rezobofakegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7501/8662/files/towubojuredumizadisejoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4213/files/bosquejos_biblicos_sobre_la_familia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/kusizadibime.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_off00006148.bin
e9837e42610606b300416497b383c9d574bac487a2c9395bf6635fdffc54a7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6148 5692 bytes
font_01_sfnt_off00007474.bin
97a99eaf00dfed6a1185656d4fd4eafb5015574faeb364f44e541263f5c08d49
pdf-font-stream PDF embedded font (sfnt) at offset 0x7474 12352 bytes