Malicious PDF — malware analysis report

Static analysis result for SHA-256 88116036effd247e…

MALICIOUS

PDF

57.7 KB Created: 2020-08-10 20:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edbad472560300459a21f9b2fd5577ac SHA-1: 990edb9ae278bcd147b273a31a229636149cf713 SHA-256: 88116036effd247e6a64e4d5e0ecb7337acb1c5459a8743f504600eb009fecfd
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, many hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=elaborated+and+restricted+codes+bernstein+pdf, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The overall structure indicates a link farm designed to distribute malicious content or phish users.

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.ru/pify?keyword=elaborated+and+restricted+codes+bernstein+pdf
    • http://files.loftzone.net/uploads/1/3/1/4/131453855/2439109.pdf
    • http://dusewoni.charlotterodenberg.com/uploads/1/3/0/7/130775169/tevopipukogagak.pdf
    • http://files.stmarymagdalenelangridge.com/uploads/1/3/0/7/130776402/c7f436b7.pdf
    • http://gurid.thealeutelder.com/uploads/1/3/2/8/132814930/giputunepemupofored.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesujegixaxufusataxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/60564782420.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5388/files/vesemija.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/12609866502.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/leximejoravevijuloragur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/symmetric_tree_leetcode.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/9919346578.pdf
    • https://cdn.shopify.com/s/files/1/0437/7824/4765/files/bilingual_education_pros_and_cons.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4269/files/6356656602.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_off0000a323.bin
edc066ed93f88e6520b85e9148508c1c2103947e5025da9a0402e89507415248
pdf-font-stream PDF embedded font (sfnt) at offset 0xA323 5244 bytes
font_01_sfnt_off0000b4fe.bin
2fc11cd09e53b39cb1c3f3d68c84dc2eaf998b9591e13647358cd74595718e83
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FE 10120 bytes