Malicious PDF — malware analysis report

Static analysis result for SHA-256 3837ec3dbc0e5ea2…

MALICIOUS

PDF

41.9 KB Created: 2020-08-14 12:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e0748453981944f0cccbbd701618531 SHA-1: 254da553fa52f3a2c4fe7d04d213b485e8cd11bf SHA-256: 3837ec3dbc0e5ea2ecc2012f9d86d27de03cd00e85226baf0d4beb8cb4c6d930
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a 'Pag-ibig multi-purpose loan form pdf'. The presence of numerous other links, many hosted on Shopify, suggests a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wb?keyword=pag-ibig%20multi-purpose%20loan%20form%20pdf
    • http://files.floorsofdistinctionltd.com/uploads/1/3/0/9/130969424/3764505.pdf
    • http://files.windwardisletransport.com/uploads/1/3/0/7/130775231/fisaf.pdf
    • http://files.mcallikat.com/uploads/1/3/1/3/131379578/dopojivo.pdf
    • http://files.gebhartcounseling.org/uploads/1/3/1/8/131857626/zunubeg-xasidudux-lofeweto-motirufexolova.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2528/files/usda_nfc_epp.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/due_to_owing_to_because_of_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/wununipif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/74165964200.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/three_column_balance_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/aql_sampling_plan_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/34433466203.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/pizesenapabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/tipigiforujuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/mezaled.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/95183652863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/pawipijelisagizopaz.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_off0000642e.bin
9ac62b694122f99575fa2595d1fef6ffe07a00775eac3ad835571fa8b983da58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 5532 bytes
font_01_sfnt_off000076e0.bin
2aa5156cf213ee53d80042ec4961eccbfaecc3fd3552cb5c0cd79741f712d5d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E0 10340 bytes

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