Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77bba1b7441f5b3…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 07:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4aeb4068531e05b4d88cbae901c212 SHA-1: a29b2293df46f9ca07b95faca368e3b6d88a9e55 SHA-256: f77bba1b7441f5b3295835b7db700697129da7e54d5759555574abda223a6a11
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=couple+photo+frame' which is likely intended to lead the user to malicious content. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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=couple+photo+frame
    • http://minoparag.tiggyrawling.com/uploads/1/3/1/4/131409926/2a77b820.pdf
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/disusabaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/impractical_jokers_episode_guide_season_8.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6209/files/82415258282.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/73681401388.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/sujijugejifu.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/number_theory_project_topics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/64748457436.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/69888503906.pdf
    • https://cdn.shopify.com/s/files/1/0438/9280/1704/files/97223408990.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/gevasoloridinunaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/72028688155.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/viwexuzitivigov.pdf
    • https://cdn.shopify.com/s/files/1/0429/5504/7068/files/flow_free_extreme_pack_11x11_level_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6562/2184/files/73885971353.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_off00006707.bin
35f37d0ce767020f3c256c2b25ec33e0fc01363e0fb9b1896657428d5f53496f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6707 4868 bytes
font_01_sfnt_off00007773.bin
1a59e7ccd57d94d8d34c118197a737198e304fbadb50a91738792d76b2ff85c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7773 10344 bytes