Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a87db19999db2fd…

MALICIOUS

PDF

45.1 KB Created: 2020-08-20 03:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f51e8f3ad998c1c48837aec2eff82f7 SHA-1: ffad90fb6225f6586e450f5a71db28d7c8e75cbf SHA-256: 7a87db19999db2fd9524b2cbe71e282ea6b48db6db47a7231fd5da4a4d30e28e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by numerous other embedded URLs pointing to potentially malicious content. The document body, though partially corrupted, contains text related to 'vlookup excel for different sheets' and a URL that appears to be a lure. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute content from various sources, potentially as part of a larger distribution network.

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=vlookup+excel+for+different+sheets
    • http://vawuxug.cailynv.com/uploads/1/3/2/6/132683024/zimoladabojenu.pdf
    • http://files.mlmedicalsupplies.com/uploads/1/3/1/8/131857114/1826782.pdf
    • http://files.pawprintzwny.com/uploads/1/3/0/7/130740141/3806184.pdf
    • http://files.catherinecarterpainting.com/uploads/1/3/2/8/132814024/8354092.pdf
    • http://files.genestewartrealestate.com/uploads/1/3/0/7/130740256/9184725.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/cbse_books_for_class_6_maths.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/mergers_and_acquisitions_icai.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/current_immunization_schedule_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0452/4644/7776/files/school_building_inspection_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/photo_to_caricature_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2775/files/tewovukugadeluxodoluga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/16445171452.pdf
    • https://cdn.shopify.com/s/files/1/0431/3268/2397/files/73704346010.pdf
    • https://cdn.shopify.com/s/files/1/0433/4315/1272/files/mario_vanquez_gallery.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/xinakujokeniziderexabole.pdf
    • https://cdn.shopify.com/s/files/1/0454/8925/8646/files/zalika.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3865/files/1906008868.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/zizaxopunagotamelivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/27684990513.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/1/0431/5496/4637/files/zizax

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000720a.bin
c9c0d91661035cc9155b3ec0ef3b0217fa527414f2da6eafd34eb846515c20b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 5132 bytes
font_01_sfnt_off00008385.bin
c0db60bc597994b47bb96ef6194b991dae3c0a138bc942fc3a65f09b60e65d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8385 10504 bytes

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