Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9217b73ae1a790…

MALICIOUS

PDF

37.7 KB Created: 2020-08-21 11:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f08384f311f4f8819a957b8e6b584b15 SHA-1: ace337e30984ad1b1c96134511cb8586c9a07b44 SHA-256: ca9217b73ae1a7902998dc18e39c33c7330398dd07c8ccea96fe3f610cf24a76
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Letter e tracing template' and the malicious URL, suggesting a lure for users seeking educational materials. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL indicates an attempt to lead the user to a malicious site.

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=letter+e+tracing+template
    • http://lufej.natureswondercamps.com/uploads/1/3/2/7/132741555/73242d8f.pdf
    • http://zezej.stereo-microscope-store.com/uploads/1/3/1/0/131070420/c048d78e759b4.pdf
    • http://mefozaneb.litturi-photography.com/uploads/1/3/2/7/132710567/rijusiwub.pdf
    • http://files.vaporservices.org/uploads/1/3/1/3/131380295/bimolapafebe-jikemasisogebe.pdf
    • http://files.jaygilman.com/uploads/1/3/0/7/130740130/660d1.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/xapipevaludetokagikux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdf
    • https://cdn.shopify.com/s/files/1/0453/9170/8328/files/adverb_of_manner_worksheet_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/abrsm_violin_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/10688938775.pdf
    • https://cdn.shopify.com/s/files/1/0455/6704/9893/files/malayalam_movies_2019_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/pazetikoforulege.pdf
    • https://cdn.shopify.com/s/files/1/0429/3145/4119/files/ennahar_journal_algerien.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/libro_calefont_ionizado_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/kujonejuzajinasat.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7794/files/24758843014.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/39479966416.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/z_buffer_algorithm_in_computer_graphics.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/
    • https://cdn.shopify.com/s/files/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052a6.bin
bdc7ee4c14d835ee64c71deafd3f9b6b4c73426fa37ce65f9ecf049123c610a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A6 5016 bytes
font_01_sfnt_off000063a1.bin
e8b40f47728d283e23383d33edbbb88a5b4b1e43fd7a908abc541ad0a5a38368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 11708 bytes

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