Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99376a60e94cf7f…

MALICIOUS

PDF

54.6 KB Created: 2020-08-13 21:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1d1c153d54959cdcf26f678212b45e SHA-1: a63c20c035a2981b5d90450c59ddec033c3b77ad SHA-256: d99376a60e94cf7f8d90ad5bc91aba560ed2f1ff922100978271d5c08a7f829e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, predominantly hosted on Shopify. One of these URLs, 'https://ttraff.com/pify?keyword=1st+grade+cbse+english+worksheets', is identified as a known malicious redirector. The presence of a large number of external links, coupled with the malicious redirector, suggests an attempt to manipulate search engine results or distribute malicious content through a network of linked documents.

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=1st+grade+cbse+english+worksheets
    • http://files.southerngypsyco.com/uploads/1/3/0/8/130813144/towosenizokagiluviz.pdf
    • http://files.beyondthegap.org/uploads/1/3/0/7/130739658/samitimizovanisel.pdf
    • http://files.bestdreamlife.com/uploads/1/3/0/9/130969942/2d8375d.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/6005/files/92939914749.pdf
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/pogalogomajoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/teoria_da_aprendizagem_social.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/27275283192.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/wipiratuzozexujipewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/franchising_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/34166768689.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2732/files/lebim.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/varapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/tafegujofafukera.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/36423472929.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0957/files/aisc_seismic_design_manual_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006929.bin
6199e5ad93acc88137cdaab473b9f7f0db700b2e16d92851f506e211e7976133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 5452 bytes
font_01_sfnt_off00007bae.bin
f9eca4e76780b12b951453d3c7b2121b538f0b110e9fbf026bba2d3ea50c8454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 6736 bytes
font_02_sfnt_off00008e76.bin
4bf373464755b8bdf624a8507bc4292fb37b5d2e0a6d243d7d10da27df35f650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E76 10700 bytes
font_03_sfnt_off0000b319.bin
459bc91fdd7ab87ea9ebc1797b1a3b948737d9d3234b6cc534cb86313abda916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB319 17492 bytes

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