Malicious PDF — malware analysis report

Static analysis result for SHA-256 da97319231776d33…

MALICIOUS

PDF

42.6 KB Created: 2020-08-03 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f196cd2fd44461ba78c16dc9b1af5bfe SHA-1: 5ca8537ff64fcf899a2ed178a579cf07a4bc2260 SHA-256: da97319231776d336a8e1249125966f3942a7b42a73dc20dec989ac7ba4a5edc
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits a PDF link farm pattern with numerous embedded URLs, many hosted on cdn.shopify.com, but one critical URL points to a redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a manual, likely to trick users into clicking the malicious links.

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=dir-+655+manual
    • http://files.craftyfoxx.com/uploads/1/3/1/1/131164033/4611064.pdf
    • http://files.thecoderecords.com/uploads/1/3/0/8/130814121/pegefoxavalof_susozewuvo_winokawege.pdf
    • http://files.outloudtheatre.org/uploads/1/3/1/4/131407102/kibojuv_woralefokaselig.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/63498447249.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/25546056539.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/zebisokipagufonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/fexulunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/safajararunokevavuk.pdf
    • https://cdn.shopify.com/s/files/1/0450/4177/8838/files/advanced_calculus_for_applications_hildebrand.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/classic_warrior_talents.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/sedatexixifimijerunidevex.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/51049269986.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/44976389112.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/jasafebofopuzenoramirid.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/50461049009.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/gamebar_presence_writer.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_off00005f78.bin
3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F78 2960 bytes
font_01_sfnt_off000069fb.bin
749c9c4806df8944fde628a2bf15cd023a3e712608e6890bfea48e05bb1bc7ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 4960 bytes
font_02_sfnt_off00007ad1.bin
aa72531b4d1f451b2a7e6ef44c270e331c096050280fb7092b132373701f418a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD1 10076 bytes

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