Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb1c957bbc0f883…

MALICIOUS

PDF

49.0 KB Created: 2020-08-07 00:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22eb1ad9ad951f4609662ab8484bcab SHA-1: c872c2f9baae7e2cebfa2773d716ffbd81ef2d49 SHA-256: 7bb1c957bbc0f883217c5f4ddc94a3dd268f9facd9e6694249cf027ec656c995
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external links, many of which point to potentially malicious redirectors. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL further supports this assessment. The document body itself appears to be obfuscated or corrupted, but the embedded links are the primary indicators of malicious intent.

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/pify?keyword=ejercicios+de+movimiento+rectilineo+uniforme+retardado+resueltos+pdf
    • http://files.fusetheatercompany.com/uploads/1/3/0/7/130775868/zifozi_susofogekuvopu_mewubunog.pdf
    • http://lazedegu.renatasellitti.com/uploads/1/3/0/8/130874304/dolosa.pdf
    • http://files.rrcustomcontractors.com/uploads/1/3/1/0/131070294/923718ef58c1.pdf
    • http://files.repaythis.com/uploads/1/3/0/7/130740180/3539141.pdf
    • http://gegegul.oldhatflytying.com/uploads/1/3/0/7/130740178/vikigure.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/65904414803.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/28686788711.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/kojimoluwep.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/40k_harlequin_codex.pdf
    • https://cdn.shopify.com/s/files/1/0436/1116/0738/files/tapogetizojawitafagere.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0827/files/59633749454.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/nvidia_gtx_970_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/panama_city_beach_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/78050345398.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/entrepreneurship_development.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/pudomumojejewasuzogola.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068d0.bin
e138011935f60fb41513bc61da7ae34ffe273da103766d33c55b386d24456c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 5392 bytes
font_01_sfnt_off00007b21.bin
3050d6847e6da8a8cfdb385f4f663ec5fec92e199d528307a635aa8235c6b9f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B21 11436 bytes
font_02_sfnt_off0000a067.bin
4df7d432bfacd39d9a4c50cb09915c8cacbf036009741f9c9314eb7fae48a072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA067 16232 bytes

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