Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17989d69b3ec876…

MALICIOUS

PDF

48.4 KB Created: 2020-08-10 21:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15182316cf7923e2318d32a748eb2da7 SHA-1: d7718bbec25781867170c26fabb3ddd8b231f016 SHA-256: d17989d69b3ec87632566874cbca55fc2b59fd426a02f7ce19f58b4817a1fd4b
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the redirector URL and the link farm heuristic suggest the primary purpose is to lure users to malicious sites.

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=malayala+manorama+news+paper+today+malappuram+pdf
    • http://files.vintagetoycorral.com/uploads/1/3/2/6/132682934/bimazozapuruwori.pdf
    • http://files.bethelbaptistgso.com/uploads/1/3/1/4/131409055/vokegujubesowiw.pdf
    • http://files.hyahheights.net/uploads/1/3/2/6/132681579/7586492.pdf
    • http://files.shorehampottery.com/uploads/1/3/0/9/130969735/wagituti-tejada-dodaweduwewix.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/tedekosivofekovumotip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/79528684823.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/80230311174.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0435/files/sonesafuvem.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/78495336933.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/estudios_experimentales_epidemiologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/1302087087.pdf
    • https://cdn.shopify.com/s/files/1/0447/9116/9185/files/remove_all_objects_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/ccie_wireless_v3_study_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/xerexexebozezidunimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/kuzored.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006edd.bin
74a561082037de88aeb2e439ef304517760749b8459e34bc2d19ad4add3ac220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDD 5220 bytes
font_01_sfnt_off0000809a.bin
644714c7e85d34ea4c69188a2732a5112dffd5a43d88fb93e4308eb0d6434207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809A 11420 bytes
font_02_sfnt_off0000a66f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA66F 4324 bytes

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