Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f111156c6bd6f12…

MALICIOUS

PDF

70.1 KB Created: 2020-08-31 13:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e30424c746f4266c849167bf37c7527 SHA-1: 4d76b15e41d9df12d39ed4399327a67ef9df4fb3 SHA-256: 1f111156c6bd6f127c32aca3927ffb485553ffc7bf728670402093dce7b30aab
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a manual for an RCA portable DVD player. The PDF also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=rca+portable+dvd+player+manual+drc98090
    • https://static.usrfiles.com/ugd/b8c837_1c88fd91eb284196bf4a88e69f2587c6.pdf
    • https://static.usrfiles.com/ugd/de02f3_ecba3b0b984648b290b15caee8e2bef3.pdf
    • https://static.usrfiles.com/ugd/2e79a6_d5544445ee0846f9a33cfc4802e4fe5f.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_ed6c514b93ad4671a6f9b02a4a4403da.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/88478406067.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/64874212826.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/rojow.pdf
    • https://static.usrfiles.com/ugd/a4d998_06229ea188e74eb1aa745493e673bb77.pdf
    • https://static.usrfiles.com/ugd/4b874d_f468b870e18b4c4f8e222651ff3156b3.pdf
    • https://static.usrfiles.com/ugd/a771bd_97b7d8e18c614f6d941aca9589ad2302.pdf
    • https://static.usrfiles.com/ugd/fb5067_7dfb06847cea453f85d08a17cc352b1c.pdf
    • https://static.usrfiles.com/ugd/0c41e7_90c3f1073b9242d9988488c58ba4a046.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/58067186018.pdf
    • https://cdn.shopify.com/s/files/1/0467/7520/6041/files/academic_english_reading_and_writing_across_the_disciplines_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2055/files/analogy_reasoning_question.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4cd.bin
93e88553e7cc14912e202e069f0dba9ff5865dd6f136afd7a6d6add8c6dcba15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 5840 bytes
font_01_sfnt_off0000c89a.bin
7f3b067ea79aae1a3fe9421f91b03092e09f2f6d84398d36807412b7f8d9166e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 2272 bytes
font_02_sfnt_off0000d272.bin
ab281e3182afade621faa421d820d5b85668932abb062e7bedd56ec76664995e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 14816 bytes
font_03_sfnt_off000100a9.bin
d1bbd0fd1f108d3e522d90e29a1a3d3d47005a5ed01dfee50e9f2d69e6a4f17f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 2444 bytes

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