Malicious PDF — malware analysis report

Static analysis result for SHA-256 df622e83eb56c399…

MALICIOUS

PDF

51.1 KB Created: 2020-09-01 03:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0699a714eb1e137189ff2282f44567 SHA-1: aa53ad82405293b6c3d704480a87a148daa77eca SHA-256: df622e83eb56c3993993d32b033f58d6ceda006787e5428ac71eb2bd275fc49c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'conjugate bodybuilding program pdf' and the malicious URL. This suggests a social engineering tactic to trick users into clicking the link, which then leads to malicious infrastructure.

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=conjugate+bodybuilding+program+pdf
    • https://static.usrfiles.com/ugd/4f270c_47a95c56125843119a9365062affef63.pdf
    • https://static.usrfiles.com/ugd/63d3ad_2abe5b494c9f4b9688178522f29a91a9.pdf
    • https://static.usrfiles.com/ugd/b5472a_f20662de41f547ce9e4a8c865c13d22f.pdf
    • https://static.usrfiles.com/ugd/e2c250_ba0f40620a2c4df2b5aa4f53dc001a0f.pdf
    • https://static.usrfiles.com/ugd/98e298_e11a83da72b647c5b2a6d1ce07732cb2.pdf
    • https://static.usrfiles.com/ugd/37428b_daedebba16d64ceba6b69790c1378364.pdf
    • https://static.usrfiles.com/ugd/8cbfce_669c4483337c47809c420a5cf81ea70e.pdf
    • https://static.usrfiles.com/ugd/b8c837_84d9bc4afe9048e6bbd9d3b386635a70.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/5684959688.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/kizhakku_cheemayile_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/french_english_dictionary_with_pronunciation.pdf
    • https://static.usrfiles.com/ugd/2c7c49_02436af39b9142439b6443ce78efff44.pdf
    • https://static.usrfiles.com/ugd/c8d394_37158fa741f14da9b52cb0d7cdbb987f.pdf
    • https://static.usrfiles.com/ugd/97493d_8c1d37dfe9e140eea67b908335a8ae67.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_off00008994.bin
f726739576d6fb1463a5d3e1998a3457b078def901a72df103aa4db1c0582468
pdf-font-stream PDF embedded font (sfnt) at offset 0x8994 5408 bytes
font_01_sfnt_off00009beb.bin
cff20ab3595a418340120694f80bc2bc253150183b9ce1d7ab44d55583376486
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEB 10420 bytes