Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5fa68086500fa3…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 06:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91f1e71431e8471995759e43a9728be SHA-1: 72404ccdad3aa79e98587543d4f30ff9e4e4c0ee SHA-256: 1f5fa68086500fa379f115503a80f9b5ab43c8cf13e27c1bf3c7763f30c63d48
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector hosted on 'ttraff.ru' which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'paypal money adder' and the malicious URL, suggesting a phishing or scam lure. The presence of numerous links to PDF files on 'static.usrfiles.com' indicates a link farm, likely for SEO poisoning to drive traffic to the malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=paypal+money+adder+2017+no+human+verification
    • https://static.usrfiles.com/ugd/b8c837_094417feb9f5406e903493728ffa6467.pdf
    • https://static.usrfiles.com/ugd/37428b_fee531eaf67a4a38bed9488ab3b73219.pdf
    • https://static.usrfiles.com/ugd/93971e_5f181a8bee7340a08cfd7dd795fe07c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe522e3589b548c8a71564471d40eba4.pdf
    • https://static.usrfiles.com/ugd/162fe6_57520908a5bc45099bef429a89331bb1.pdf
    • https://static.usrfiles.com/ugd/b4609a_8899223fb1c646f0a1f38835572a3349.pdf
    • https://static.usrfiles.com/ugd/e8506d_db535b8283f143e484ec9cde95e1c7b3.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/36691286571.pdf
    • https://cdn.shopify.com/s/files/1/0433/8994/3975/files/fedders_portable_air_conditioner.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/teamviewer_11_min_ph.pdf
    • https://cdn.shopify.com/s/files/1/0463/4066/9602/files/nyc_subway_map_manhattan.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/30138616105.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7e816df90f84078a149fb3bc402d79b.pdf
    • https://static.usrfiles.com/ugd/d54300_5d0e6bb336744bbca9a894d499cee574.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_223591c7d9f14a5cbbe81304a509c3c1.pdf
    • https://static.usrfiles.com/ugd/b65acf_2a0bb6fc80184a65bd60ecbcb9ac6880.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_off0000670d.bin
25e7dad834a2cca017312e05fe900446ee6f9712cf31bfb7c1bd7f2172749e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x670D 5784 bytes
font_01_sfnt_off00007aa7.bin
6e5ddb47b165363453db4f9dd77af8e254820892d8f7d5aa00a0a35ac3982089
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 11380 bytes