Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67f176138a66d1f…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 18:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cecfe568b6773386b736d175333df3f SHA-1: 34da14e00618212653ab557e480cf5159cf00bc3 SHA-256: a67f176138a66d1fac93757b4789c6b416e5e10b81e8c33c769cb58f2be13f8b
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though partially corrupted, contains text related to 'Gazetted officer form for address proof' and the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious URL disguised as a legitimate form.

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/wix?keyword=gazetted+officer+form+for+address+proof
    • https://static.usrfiles.com/ugd/1e4819_54811adc1ce34ee3b07340b525177b1d.pdf
    • https://static.usrfiles.com/ugd/c1de29_aedcbf7b6f45407aa2809ce71eb1812a.pdf
    • https://static.usrfiles.com/ugd/8b97dd_5ff4980b285b4bf6bb1873a4f4bb848f.pdf
    • https://static.usrfiles.com/ugd/d1d005_d468f461d4354058a953f99769569614.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_60ac827ba8f74d7697190778055010c7.pdf
    • https://static.usrfiles.com/ugd/fbccce_68f06f67ad474baba3f389f8a2b9ab08.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ce9fba7b8f487da62bb35dc16ce0a2.pdf
    • https://cdn.shopify.com/s/files/1/0440/7489/3477/files/90099678247.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0835/9589/files/applications_of_mathematics_in_real_life.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/72917283137.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/chiari_malformation_type_1_prognosis.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_off00006831.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 2828 bytes
font_01_sfnt_off0000722b.bin
af13135f1bc94090669b5fcd63d58708bdb855ff43d1cad4aabe09d47c573f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x722B 5348 bytes
font_02_sfnt_off00008455.bin
d39baeb589ccf60d5bdb3dd9b4037917c9f8c3819d02d133a931e3662f59b0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8455 11176 bytes