Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96b4cef99fe68c4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-19 00:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a6a62580f1abd31aa4d7b6547fea96 SHA-1: d2de555f8bf54c442ec1f5efef001207486e9257 SHA-256: a96b4cef99fe68c40cdbb701e8a2f74443c53a49af981992a5eb5576479d1ca7
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL and references a worksheet, suggesting a lure to trick users into clicking the link. The ML classifier 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=limiting+reactants+chem+worksheet+12-+3+answer
    • http://files.lifespirepa.com/uploads/1/3/1/3/131397955/4127110.pdf
    • http://wolawugo.ngsports.net/uploads/1/3/0/8/130813557/negoji_rerivevonurajow_serixiw.pdf
    • http://jadeg.myownmarketingcoach.com/uploads/1/3/1/3/131383839/8099945.pdf
    • http://files.saddleuphorseproducts.com/uploads/1/3/1/4/131452963/modewoninep_lazav.pdf
    • http://jajubavef.guardianservices.com/uploads/1/3/1/3/131380042/8620e9235e63ce3.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/74904024910.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/lotigudesi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1181/files/vujokexorejetobabotusosi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/career_burnout_causes_and_cures.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/81613460829.pdf
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/branca_de_neve_irmos_grimm_original.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/jomojitepawutif.pdf
    • https://cdn.shopify.com/s/files/1/0443/1914/6140/files/system_analysis_and_design_course_outline.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_off00005e62.bin
cc35c2a487efedc5ead2dbcb7f4b277f0ce66591b8a8fb9c889043712cf25ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 5656 bytes
font_01_sfnt_off0000718f.bin
94d33bc7ba8ddd87250ce4f08e25538f49c89f4ae72299bafcfe427170d8e785
pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 9800 bytes