Malicious PDF — malware analysis report

Static analysis result for SHA-256 90aba313491e32e3…

MALICIOUS

PDF

35.1 KB Created: 2020-08-31 02:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a22021b971813384584ad1c1716d52 SHA-1: eb3afb678dd9185e4c2aaea02a22b680cd9cd936 SHA-256: 90aba313491e32e32b19183708e9c1e6dcd3ca63101a7de42da50c1ba168ec50
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com and a redirector at ttraff.com. The document body text, though garbled, contains a reference to 'drake lust for life download', suggesting a lure to trick users into clicking the malicious links. 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.com/wix?keyword=drake+lust+for+life+download
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/tujexomijulupadogin.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/ms_sql_command.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/clinical_pharmacy_and_therapeutics_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0462/2663/6954/files/73237621247.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/94708697865.pdf
    • https://static.usrfiles.com/ugd/f63f29_55e190452f0a425483f24ef30abb0252.pdf
    • https://static.usrfiles.com/ugd/55f640_4cc5415236f74bf790b00eff27fb7e42.pdf
    • https://static.usrfiles.com/ugd/4b7290_d60f687a854b4770a32186cd92abfa6b.pdf
    • https://static.usrfiles.com/ugd/e02969_5906f7969f024aac944ceb059fbdcccc.pdf
    • https://static.usrfiles.com/ugd/4d400c_6be711020e8c4435ad7edea7b9f98c5c.pdf
    • https://static.usrfiles.com/ugd/585b1d_c57273b7e2ad4bd9ac4b0cc391a1d965.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_51b2dbe17fed40d7b00512d2e25f8800.pdf
    • https://static.usrfiles.com/ugd/451a43_894009a3bffa41b9aa50c36641d35d55.pdf
    • https://static.usrfiles.com/ugd/b8c837_4275fff636264bcd9c8b473c06ad75c9.pdf
    • https://static.usrfiles.com/ugd/29c71c_8c82e999951c46878911c2f9e496cfcb.pdf
    • https://static.usrfiles.com/ugd/fe83c3_850c6bd1c2d749b698e88f3cacb91ec0.pdf
    • https://static.usrfiles.com/ugd/01e791_08f1f1b939434768acea17f2054f16bc.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_off00004c45.bin
0e541d381b63e45813fc2673e293fd1bad951ae202285f70e8bdde606bc9e8a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C45 5056 bytes
font_01_sfnt_off00005d9e.bin
080263415484393c7fad7bde43cc5d5624cbf9c11891366825595f2b62463fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9E 9904 bytes