Malicious PDF — malware analysis report

Static analysis result for SHA-256 555c7a2011a7851a…

MALICIOUS

PDF

47.6 KB Created: 2020-09-05 10:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd11a99fbde8a9f126a1e3923292bbbe SHA-1: 5eb2fb307f51fc19d43719b3b7ae1ff38f74616d SHA-256: 555c7a2011a7851a3baee0f1ea49f51a182cfb000c716e56ee4a8de23f6c44b4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external links, suggesting a link farm. The embedded document body contains the URL https://ttraff.link/wix?keyword=kyon+barfi+song++songs.+pk, which is likely the primary malicious payload delivery mechanism.

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.link/wix?keyword=kyon+barfi+song++songs.+pk
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/invensense_mpu-_6050_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/16520729803.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/linodemavukono.pdf
    • https://cdn.shopify.com/s/files/1/0463/4175/0945/files/administrative_officer_resume_format.pdf
    • https://static.usrfiles.com/ugd/8ab72e_29350989d2d54ca6af3ad7b8bf8380ed.pdf
    • https://static.usrfiles.com/ugd/b1b16e_8e24563c42c14448a00650ff65e62f01.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_7c7c604dd6674d04baa38907aa7d9958.pdf
    • https://static.usrfiles.com/ugd/3b5dd9_f0e3dfa4ba4045eb92b5ccb938d440e2.pdf
    • https://static.usrfiles.com/ugd/dbbfd0_39a2d025a2d541c39a0ce6a0170b4b10.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/breadth_first_search_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/12_cranial_nerves_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0435/7213/4049/files/phonemic_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/handbook_of_green_building_design_and_construction.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/jodigo.pdf
    • https://static.usrfiles.com/ugd/c83fdb_6c5723d648f54f23880aadb0102540d2.pdf
    • https://static.usrfiles.com/ugd/238140_75485872d2a543a28a6c3b05c37a1041.pdf
    • https://static.usrfiles.com/ugd/b8c837_8614395f95f14a9492019aaa4f76754e.pdf
    • https://static.usrfiles.com/ugd/e78b77_41f27ed6777e4e3a81a5ef490ab88e40.pdf
    • https://static.usrfiles.com/ugd/575363_e2f5a21697fb4b4cb92d5e453117c93d.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_off00005306.bin
dbf3fceefb8c266a3dbeb7840d4fdcde8be7472a747e100e2011ab613ee9b951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5306 5344 bytes
font_01_sfnt_off00006555.bin
11ab760e88f6b6b1b892d42f7bbd4de29eb112c54895f6d4af5690820a1ea7f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 14084 bytes
font_02_sfnt_off000091c2.bin
9e8409b995ac2b0bb76eb3eb8dd1c90fa55d1c1c8a40bb5daa08ca4080948d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C2 18776 bytes

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