Malicious PDF — malware analysis report

Static analysis result for SHA-256 11772c270b8fbdc7…

MALICIOUS

PDF

35.6 KB Created: 2020-08-01 15:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abb92821e8799998a67439de75ba863d SHA-1: e7fb0cdbde455b6fe3ce43385ba6ca3915b562cb SHA-256: 11772c270b8fbdc70bd5321ff06751f2e149b5ed8b8decee02f9448e3b2caab8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a screenshot lure, typical of phishing campaigns, designed to trick users into clicking a link. This link, identified as a malicious redirector, leads to further infrastructure. The document also hosts a large number of external PDF links, likely for SEO manipulation or to obscure the primary malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 35 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=precalculus+with+limits+larson+second+edition+pdf
    • http://files.habitatlacrosse.org/uploads/1/3/1/6/131606006/mowidibuw-dibojuzisawega.pdf
    • http://files.washington-commons.org/uploads/1/3/0/8/130814411/xulem_pujifajikizuv.pdf
    • http://files.winterra.ca/uploads/1/3/1/0/131070894/vitesi-kuwus-fikudeworodub-fopujazunap.pdf
    • http://files.temperanceparkequestrian.com/uploads/1/3/0/7/130738673/nafubimon.pdf
    • http://www.LarsonPrecalculus.com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/valurosumuvamimofif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/sukifosokutisawofom.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/vipejeretos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/75283207721.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/83066021379.pdf
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/51435046713.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/sesibamawexufulevo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/jivisaxibuzuvigepewese.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/54735578419.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/rosod.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/lipalazoloxipokotibajibek.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/jozipokozife.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/95883650940.pdf
    • https://www.nxtbook.com/nxtbooks/ngsp/finan
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005221.bin
e623f167094f98bf39763a5de9d284841047cc931a33c83114ba6ddf45a1d00e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5221 5488 bytes
font_01_sfnt_off000064b0.bin
c7f1e7d78a648f43210571df12c2a6b9520f0f68b2e621ffc3f64fd88e5d0ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 8332 bytes

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