Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b1fb822ca48fc…

MALICIOUS

PDF

43.9 KB Created: 2020-09-02 04:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81f9ffbaf2b0e994d3c2ed2e62663517 SHA-1: 17fbebe123f50b130248112721b3116cfd4c7808 SHA-256: 019b1fb822ca48fc682a19ab85e3a77957f87fb3edbce45e66b030c1817ea10b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Audiobook player pro apk' and the malicious URL, suggesting a lure to redirect users to potentially harmful content. 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=audiobook+player+pro+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/jalujuxurisexu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/99871720686.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/70766023436.pdf
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/zajutu.pdf
    • https://static.usrfiles.com/ugd/37428b_764815ad5a66447396aaa19c2cbbb68f.pdf
    • https://static.usrfiles.com/ugd/865d50_3db9adaff4fc44ae9691adcbfacd6b00.pdf
    • https://static.usrfiles.com/ugd/4479ed_14da612b0d4948eba1f121b3e4f6df65.pdf
    • https://static.usrfiles.com/ugd/ba3095_84e609e008b94100ac6c3bb60c2bbbc7.pdf
    • https://static.usrfiles.com/ugd/77941b_2518db0571874d049b8cccd8706a914e.pdf
    • https://static.usrfiles.com/ugd/278743_84d2b38849844a2eadc1cc45c3d451d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c0238f118ca4d269845d0bdfe52e7ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbd9e75d778640b4b357b5f909b12d62.pdf
    • https://static.usrfiles.com/ugd/04e6f9_3ac0f357f0ca48cea24b38f36350c80a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff0917d947c45d19f3b22cda3ddc578.pdf
    • https://static.usrfiles.com/ugd/f3cb45_0464ccfbe93a410095af062c5c39748d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000614c.bin
8ace23cfa3c124075c7fae34c1787b095f4d5f51641c0beec00ca731eea60133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614C 4764 bytes
font_01_sfnt_off0000718b.bin
aca6b04f69c7e837e9a9def0d6a938a65ce6711eef60b1b19a4520c65bf206a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 10500 bytes
font_02_sfnt_off000094f1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F1 4324 bytes

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