Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aeef55b8552abc…

MALICIOUS

PDF

52.6 KB Created: 2020-08-12 20:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e24bd2cea40e093dffc0be9ead98b71c SHA-1: 3ebd50a0a54f590d4191fb1075cc01ee2433960b SHA-256: a2aeef55b8552abc32d2bb77fdc85a3dcc50f1041c92bdd98d2147e7f3028f21
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the document's primary purpose is to lure users to malicious sites, likely for further exploitation or credential harvesting.

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=goldman+principles+of+clinical+electrocardiography+pdf
    • http://files.sarahpoulgrain.com/uploads/1/3/2/7/132740978/8bb4e13.pdf
    • http://mabew.studioconnection.net/uploads/1/3/1/6/131606552/bf339257114.pdf
    • http://files.cuttyantiques.com/uploads/1/3/0/7/130738712/d91da7f86.pdf
    • http://zufidi.ennisexterminating.com/uploads/1/3/1/6/131606260/3928999.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/fabijixiboguvilabofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7590/files/40848991231.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/90832024289.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/45082760187.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/41933197052.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/49359570600.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/atomistique_et_liaison_chimique_cours_et_exercices_corrigs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/kejuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/73996302649.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/xafuxitivunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7541/1872/files/soxizokip.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/51192050960.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/vukididevujorurun.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_off000083ae.bin
66901edaeb42ea745539a1857f3d037c4179a6aec9b3898421a865acc0b178ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83AE 5704 bytes
font_01_sfnt_off000096ed.bin
8a8fc8a3cd996646e42493be7b9d2bf9b4402ad51bee190ad9e1cdbcf52754f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96ED 14828 bytes

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