Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff56f69e25b0eb34…

MALICIOUS

PDF

46.3 KB Created: 2020-08-17 15:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e871e1160adfde0eb32f03d2cd5816 SHA-1: 9d3c289bdc4b8c9d7f9565be055653ec73291bc8 SHA-256: ff56f69e25b0eb340f35199dbe50f5f573c86dd2a778db03dbb8cfc0a2b39ffd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, contains the malicious redirector URL. This suggests the primary goal is to redirect 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.cc/pify?keyword=vikram+lander+photo
    • http://zebovisa.palmettovocalproject.com/uploads/1/3/1/0/131070450/zamelone.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/14972822011.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/31670721970.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/mesivodaja.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/8486758113.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/56173044441.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6110/files/nefatinerenoguxixodupovos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/mozafijipuwox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/english_thesaurus_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/82282542128.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8917/files/60919293062.pdf
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/dubawavafivepemutuzekeka.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/nuzizuzowudofililavizola.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/tally_erp_9_interview_questions_and_answers_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/74976222682.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_off00006a08.bin
411c8e88b05e41bf08c5b00c78a68f1e678737b3e928f7df24c908389030c17e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 4840 bytes
font_01_sfnt_off00007a3a.bin
e039918df8076fbda838baf5867d0567a696906a8b2e8e70333bb8eeab6c4be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3A 10668 bytes
font_02_sfnt_off00009e88.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E88 4324 bytes

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