Malicious PDF — malware analysis report

Static analysis result for SHA-256 4613bf344ca6a9f4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 18:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08cee86ec8320945d84fab3810379e87 SHA-1: ae5e17a684fcc996c1328008a4163bac9cfc9bc1 SHA-256: 4613bf344ca6a9f4dc8c75266b2c17473d01edad91947fe4f0bbc14add90ae0d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'powerpoint viewer free'. The primary malicious IOC is the redirector URL, which is likely used to serve further 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/wix?keyword=powerpoint+viewer+free
    • https://static.usrfiles.com/ugd/fac845_c1d4e6aacf9b44659ab0c310fdd50ea5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1dd12f2921e4ba1bb4d86d1fff3773f.pdf
    • https://static.usrfiles.com/ugd/0c41e7_c1ea09d5d6f346169494d316dbff49fc.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/gobatimigupipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/39876835943.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/99008489175.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/45317148315.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/80849609240.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/bartleby_le_scribe_melville.pdf
    • https://cdn.shopify.com/s/files/1/0437/2971/5354/files/20394755304.pdf
    • https://cdn.shopify.com/s/files/1/0446/6160/4505/files/nyc_210_form_2015.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/zewezeborowodinudipozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/hosts_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/vuzotigijazejepaken.pdf
    • https://cdn.shopify.com/s/files/1/0434/2906/8949/files/wejitefu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/vampire_the_masquerade_bloodlines_carnival_of_death.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_off0000640b.bin
635410725e52f56edbf5a1a07136d87775a13366027f4d6380cb34c12b640545
pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 4628 bytes
font_01_sfnt_off000073f1.bin
24714a538c4dc57c56e9fd40da4d97825ec007be1b8b510caf980efca23c8aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F1 14296 bytes