Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc2bbce15c038f3…

MALICIOUS

PDF

44.3 KB Created: 2020-08-01 03:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d398b1dea5511d54a97a6a9242df3436 SHA-1: 5504feadb45bbec074d5ab49c238745bff1085fe SHA-256: dcc2bbce15c038f382586f8a49763f5c37ad1a2ee9f0729e05ebafbfee764b51
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL and a reference to 'wkhtmltopdf', suggesting it's a generated document. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a lure to a malicious URL.

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=introduction+to+econometrics+stock+watson+pdf
    • http://files.nebraskatraileroutlet.com/uploads/1/3/1/4/131483719/5930116.pdf
    • http://files.theroanokerestaurant.com/uploads/1/3/1/3/131380445/padami.pdf
    • http://files.guesshowmuchiloveyoujewellery.com/uploads/1/3/0/7/130738482/wufujisaku-vubaxubesonatof-vumusuxipokilom-xisusuniradet.pdf
    • http://wps.aw.com/aw_stockwatsn_economtrcs_1Questions
    • http://www.economics.harvar
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/64170462380.pdf
    • https://cdn.shopify.com/s/files/1/0437/9249/8850/files/7562232411.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/xejelujejaweninegawinaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8711/files/93463151205.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/14062275465.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/xatavurubudum.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0792/files/tevuzatozaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/40094303488.pdf
    • https://cdn.shopify.com/s/files/1/0434/4270/0455/files/65890897421.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/pugofupagifadamepow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/91917976047.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/benemezejiziti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000615f.bin
1c293d0e5b605a67f8b3f27b900cca71499c44d1be9fa542751744504ab02f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615F 5244 bytes
font_01_sfnt_off00007329.bin
21f1aaf2eca0eda4904d88900c592571f7e07225355f867467179692077de321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 10124 bytes
font_02_sfnt_off000095d5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D5 4324 bytes

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