Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c9b07e929d73e8…

MALICIOUS

PDF

35.8 KB Created: 2020-08-05 07:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52fb2d1513eff2411f7edbf20164edf SHA-1: 65efe76cfdebf2404b96b8e910abb6f618b2fe77 SHA-256: b9c9b07e929d73e885f926db7abc6e6a8930fa12853764d4a242ff0dd9d45cfd
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.com/pify?keyword=basic+english+conversation+worksheet+pdf'. The document body, though partially corrupted, suggests a lure related to an 'english conversation worksheet pdf'. The ML classifier strongly indicates maliciousness, and the presence of many external links points to a link farm or redirection strategy. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive document content leading to malicious URLs.

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.com/pify?keyword=basic+english+conversation+worksheet+pdf
    • http://files.ohmygiftshop.ca/uploads/1/3/0/7/130775046/dakak_litum_lageweb_birerelisodiva.pdf
    • http://files.andrewandykeithanderson.org/uploads/1/3/1/6/131637928/wufezot.pdf
    • http://files.aycliffe.net/uploads/1/3/1/3/131379213/jebonabuliko.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/6597209988.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/tifoduxono.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5978/files/46707565491.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/selenagomez_falling_down.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/40736753587.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/wivuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/70918759208.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/crucial_memory_scan.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/lozajorozuxesureforegivig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/fixawuwozopedibebi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3765/files/aim_to_misbehave_destiny_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/2171/9959/files/pfms_bank_list.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_off00004d13.bin
96fe56bd95540d26a210a311f32ff85cc3e3356bb7785e88924c2fa308368fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D13 5680 bytes
font_01_sfnt_off00006078.bin
0f218931869d42e85e731f3cda18d59f311fbd1650add407b53f3ba0ece9a9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 9948 bytes

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