Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1ac53cdce9f559…

MALICIOUS

PDF

34.8 KB Created: 2020-08-19 13:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ea18b07083cadee3d6134938beaad4 SHA-1: d242b891ebdc8cb8256f9bb04e5ee22a392b1c29 SHA-256: 7c1ac53cdce9f5594a71553c87f8baa9e600cab8356b55cabdf5d2a32c02ba15
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a malicious redirector link. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results to drive traffic to malicious sites. The document body, though partially corrupted, contains text related to 'solids liquids and gases worksheet answer key' and the malicious redirector URL, reinforcing the lure. 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.cc/pify?keyword=solids+liquids+and+gases+worksheet+answer+key
    • http://files.moneimadwan.com/uploads/1/3/1/3/131383630/7148480.pdf
    • http://files.dumperparts.co.uk/uploads/1/3/0/7/130776529/tilatenegowefe_sujab.pdf
    • http://zakutetab.crfamilyweekends.com/uploads/1/3/1/3/131383483/2032070.pdf
    • http://kixoga.txokgoldstarmoms.com/uploads/1/3/0/7/130739935/nalekozigu.pdf
    • http://files.jlbpsychology.com/uploads/1/3/2/6/132682745/jirover_bafoja_fenosakido.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/4489817679.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/lapavakutujure.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/jitapuraros.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/alkane_alkene_alkyne_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/milavuxuwabidesavawexabos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/cardiorespiratory_assessment_for_physiotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/pearson_biology_textbook_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/5974/7745/files/vekebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/42194200494.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/bigawedifatofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/fatati.pdf
    • https://cdn.shopify.com/s/files/1/0440/8305/2696/files/fijaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0940/files/making_breakthrough_innovation_happen_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/balofavidabowifa.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_off00004b88.bin
7362693dab5439b2fd895333bb210d51d3e387a5417a0dd01227b2c7e3799d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B88 5572 bytes
font_01_sfnt_off00005e79.bin
49bb08fcecef33252db3f0e853c4dac854254b594f261e4388ac065aca2039ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E79 9200 bytes

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