Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4844ec9df07ff1…

MALICIOUS

PDF

48.2 KB Created: 2020-08-08 20:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aa968898788fb5077a7a0b13e7fba2c SHA-1: 647f09ce2f1fe8d520b049eb5e012ca59de2149d SHA-256: 5f4844ec9df07ff1120c46dec859369aa7b4b3f6b6408690d6dec245a889cc78
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'maternity leave form' and the malicious URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic points to an attempt to lead the user to malicious 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.ru/pify?keyword=maternity+leave+form+for+teachers+pdf
    • http://zuxizutow.valleyalternativehealing.com/uploads/1/3/1/4/131407263/247433.pdf
    • http://files.psichicpp.com/uploads/1/3/1/8/131871585/vinazuxuje.pdf
    • http://files.andaveycrea.com/uploads/1/3/0/9/130969389/pulogile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/lizatujebefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/85282101865.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/faneburozusexipuvunafega.pdf
    • https://cdn.shopify.com/s/files/1/0428/5962/6655/files/37052489364.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/xogegeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5223/5938/files/tekuwudakanitetob.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/jakozof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/lokufudejubuzujufowefek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/12674505341.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/37994997162.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/vaxivosisinabuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632e.bin
4b21ca6a6f60e1dd148b1d345355a9b629edb198e82f20bcccfd580a51271c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 5564 bytes
font_01_sfnt_off0000760c.bin
dcf441d3023b3b9eda6f43b1fa580eefacac6e1caa31393eeb910729df67bffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760C 9916 bytes
font_02_sfnt_off0000981f.bin
ce3b4bc0ec0937bb5de983369fbc765f557d14d302a9d517e284aeda5d97d020		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981F 8008 bytes

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